GreyNoise IP Checker

GreyNoise has a web site that checks the external IP address in question to determine if malware was been detected in the past.

https://check.labs.greynoise.io/

https://www.bleepingcomputer.com/news/security/greynoise-launches-free-scanner-to-check-if-youre-part-of-a-botnet/

Technitium DNS Server

Technitium DNS Server is available for multiple platforms and offers a web-based dashboard.

https://technitium.com/dns/

https://www.howtogeek.com/block-ad-traffic-and-speed-up-your-browsing-with-these-3-free-open-source-dns-tools/

Mailspring

Mailspring is an email client that offers a basic edition for free.

https://www.getmailspring.com/

https://www.howtogeek.com/i-replaced-outlook-with-this-open-source-email-client-and-it-is-not-thunderbird/

RaspAP

RaspAP is a Linux distro that is designed to make a Raspberry Pi as a router.

https://raspap.com/

KSnip

KSnip is a cross-platform screen capture utility.

https://github.com/ksnip/ksnip

https://www.howtogeek.com/3-tiny-open-source-apps-that-pack-a-ridiculous-amount-of-power/

Cayosoft Guardian Protector

Guardian Protector is a free agent-less monitoring solution that delivers insight across Active Directory, Microsoft Entra ID, and Microsoft 365 services.

https://petri.com/cayosoft-guardian-protector/

https://www.reddit.com/r/CayosoftGuardian/wiki/howto/

GoSpoof

GoSpoof is a deception tool that can be executed as a honeypot.

https://www.blackhillsinfosec.com/gospoof-turning-attacks-into-intel/

https://github.com/blackhillsinfosec/GoSpoof

SuperTuxKart

SuperTuxKart is a free game available for multiple platforms.

https://github.com/supertuxkart/stk-website

https://supertuxkart.net/

VSCodium

VSCodium is a community-driven free binary distribution of Microsoft’s editor VS Code.

https://vscodium.com/

Windhawk

Windhawk is an open-source program that features several customization options for Windows.

https://windhawk.net/

Senior Launcher

Senior Launcher is an launcher for Android that offers a simple interface with larger icons.

https://play.google.com/store/apps/details?id=com.eldo.launcher

Another example would be a Senior Home.

https://play.google.com/store/apps/details?id=com.seniorlauncher.app

https://www.androidpolice.com/i-tested-a-launcher-made-to-declutter-android-and-its-a-hidden-gem/

MSRC-PatchReview

MSRC-PatchReview is a PowerShell script that offers analysis with Microsoft patch bundles.

https://github.com/f-bader/MSRC-PatchReview

https://www.checkyourlogs.net/automating-microsoft-patch-tuesday-analysis-with-powershell/

PnP PowerShell

PnP PowerShell is a open-source set of cmdlets for SharePoint Online.

https://practical365.com/manage-your-sharepoint-online-environment-with-pnp-powershell/

https://pnp.github.io/powershell/articles/installation.html

https://practical365.com/optimizing-sharepoint-online-performance-for-large-document-libraries/

https://petri.com/connect-pnponline/

Get-NetTCPConnection

The Get-NetTCPConnection cmdlet within PowerShell can offer details on various network connections.  

The following command shows which ports are listening:

Get-NetTCPConnection -State Listen

Which connections are active:

Get-NetTCPConnection -State Established

Show connections to destination port 443:

Get-NetTCPConnection -State Established -RemotePort 443

Display traffic to a remote IP address:

Get-NetTCPConnection -State Established -RemoteAddress 8.8.8.8

The OwningProcess field can help identify which service or application is the source of the traffic:

Get-NetTCPConnection -State Established -RemotePort 443 | Select OwningProcess

Get-NetTCPConnection | Select LocalAddress, LocalPort, RemoteAddress, RemotePort, State, OwningProcess, @{n="ProcessName";e={(Get-Process -Id $_.OwningProcess).ProcessName}}, @{n="UserName";e={(Get-Process -Id $_.OwningProcess -IncludeUserName).UserName}} | Where {$_.State -eq "Established"} | FT -autosize -Force

The code below shows the oldest 10 connections:

$now = get-date

Get-NetTCPConnection |  select-object LocalAddress,LocalPort,RemoteAddress,RemotePort,State,@{Name="LifetimeSec";Expression={($now-$_.CreationTime).seconds}},OwningProcess, @{Name="Process";Expression={(Get-Process -Id $_.OwningProcess).ProcessName}} | sort-object -property LifetimeSec | select-object -last 10 | ft -auto

The command below includes DNS names:

Get-NetTCPConnection -State Established |Select-Object -Property LocalAddress, LocalPort,@{name='RemoteHostName';expression={(Resolve-DnsName $_.RemoteAddress).NameHost}},RemoteAddress, RemotePort, State,@{name='ProcessName';expression={(Get-Process -Id $_.OwningProcess). Path}},OffloadState,CreationTime | FT

The Get-NetUDPEndpoint cmdlet is similar but shows UDP traffic.

Get-NetUDPEndpoint  | select LocalAddress,LocalPort,CreationTime,OwningProcess,@{Name="Process";Expression={(Get-Process -Id $_.OwningProcess).ProcessName}} | ft -auto

https://woshub.com/get-nettcpconnection-windows-powershell/

https://isc.sans.edu/diary/30532

PDF24 Creator

PDF 24 Creator is a free PDF utility for Windows.  An option is available to download the app from the Microsoft Store.

https://tools.pdf24.org/en/creator

NetPeek

NetPeek is a GUI network scanner.

https://github.com/ZingyTomato/NetPeek

https://www.omgubuntu.co.uk/2025/08/netpeek-linux-network-scanner-gui-alternative-nmap

Maester

Maester is a PowerShell module to perform security checks for a Microsoft 365 environment.

https://maester.dev/

 

MFCMAPI

MFCMAPI is an utility that provides access to MAPI stores to facilitate investigation of Exchange and Outlook problems.

https://github.com/microsoft/mfcmapi

https://office365itpros.com/2023/10/27/mfcmapi-utility-primer/

Dirsearch

Dirsearch is an open-source multi-threaded “web path discovery” tool.

https://github.com/maurosoria/dirsearch

https://www.blackhillsinfosec.com/how-to-use-dirsearch/

YTDLnis

YTDLnis is a media downloader for Android.

https://github.com/deniscerri/ytdlnis

Metrolist

Metrolist is an alternate YouTube Music frontend app for Android.

https://github.com/mostafaalagamy/Metrolist

NetExec

NetExec is an open-source tool designed to conduct network reconnaissance, lateral movement, and security assessments within an Active Directory environment.

https://github.com/Pennyw0rth/NetExec

https://www.blackhillsinfosec.com/getting-started-with-netexec/

Koodous

Kroodous is a web site that offers an option to scan .APK files for malicious content.

https://koodous.com/ 

dsregcmd

The dsregcmd utility is a Windows command-line tool used for troubleshooting device registration and authentication issues with Microsoft Entra ID.

https://learn.microsoft.com/en-us/entra/identity/devices/troubleshoot-device-dsregcmd

https://petri.com/dsregcmd/

PowerToys Run plugins

PowerToys has an option to add additional plugins to the default Run option.  Below are a few examples of various modules.

https://github.com/microsoft/PowerToys/blob/main/doc/thirdPartyRunPlugins.md

https://github.com/ruslanlap/PowerToysRun-SpeedTest

https://github.com/ruslanlap/PowerToysRun-VideoDownloader

https://github.com/ruslanlap/PowerToysRun-Definition

https://www.windowscentral.com/software-apps/windows-11/3-secrets-you-wish-you-knew-sooner-about-powertoys-on-windows-11

Kvaesitso

Kvaesitso is a free and open source launcher for Android.

https://kvaesitso.mm20.de/

https://github.com/MM2-0/Kvaesitso

LibreELEC

LibreELEC is a minimalist 'Just enough OS' Linux distribution for running Kodi.

https://libreelec.tv/

https://archive.org/details/libreelec-raspberry-pi-5

Harden Windows Security Project

The Harden Windows Security Project is intended to offer an easier method to enable security parameters within Windows.  It is a PowerShell module.

https://github.com/HotCakeX/Harden-Windows-Security/tree/main

https://4sysops.com/archives/assign-recommended-windows-security-settings-with-the-free-harden-windows-security-app/

Microsoft Edit

Microsoft Edit is a new edition of the previous DOS editor.

https://github.com/microsoft/edit

https://www.howtogeek.com/i-love-microsofts-new-vim-alternative-but-im-worried-itll-be-copilot-ified/

ViVeTool GUI

ViVeTool GUI lets you easily enable, disable and search for new hidden Features in Windows Insider Builds.

https://github.com/PeterStrick/ViVeTool-GUI

https://4sysops.com/archives/vivetool-enable-hidden-windows-features/

Packet

Packet is a partial implementation of Google's Quick Share protocol that lets you send and receive files wirelessly from Android devices using Quick Share.

https://github.com/nozwock/packet

https://www.omgubuntu.co.uk/2025/06/packet-linux-android-file-transfer-app-quick-share

Orb

Orb is a free app to diagnose Internet connectivity issues.  It is available for multiple platforms.

https://orb.net/ 

Asciinema

Asciinema is a free and open source solution for recording terminal sessions with Linux.

https://asciinema.org/

https://www.howtogeek.com/how-to-record-linux-terminal-with-asciinema/

PowerTree

PowerTree is a PowerShell module that is a replacement for the old tree command.

https://github.com/spaansba/PowerTree

https://petri.com/powertree-powershell-visualize-file-structure/

Bandwhich

Bandwhich is a real-time network monitor that displays live network connections within Linux.

https://github.com/imsnif/bandwhich

https://www.howtogeek.com/great-linux-utilities-to-monitor-your-system-resources-in-the-terminal/

Espanso

Espanso is a cross-platform and open-source text replacement (or text expander) tool.

https://espanso.org/

https://www.blackhillsinfosec.com/espanso-text-replacement/

Sites that offer older games within a web browser

Below are a few sites that offer older games via a web browser that require no local installation.

https://freevideogames.org/

https://www.free80sarcade.com/

https://www.retrogames.cc/

Manzan

Manzan is an open source project designed to simplify IBM i system operations and monitoring.

https://theprez.github.io/Manzan/#/

https://www.itjungle.com/2025/05/05/ibm-unveils-manzan-a-new-open-source-event-monitor-for-ibm-i/

Zen Browser

Zen Browser is an open-source web browser based on Firefox but focused on privacy.

https://zen-browser.app/

https://github.com/zen-browser/desktop

FlyBy11

Flyby11 is a patcher that removes the restrictions preventing from installing Windows 11 (24H2) on unsupported hardware.

https://github.com/builtbybel/Flyby11

OneCommander

OneCommander is a modern file manager for Windows 11.  It is free for personal use.

https://onecommander.com/

https://www.howtogeek.com/this-file-manager-solves-all-my-windows-file-explorer-woes/

DietPi

DietPi is an operating system designed for Raspberry Pi devices.

https://dietpi.com/

https://www.howtogeek.com/what-is-dietpi/

Orbit

Orbit is a Nuclei security scanning and automation platform.

https://orbitscanner.io/

https://github.com/orbitscanner/orbit

https://www.blackhillsinfosec.com/introducing-orbit/

Portmaster

Portmaster is an application firewall that is available for Windows and Linux.  A limited free version is available.

https://safing.io/

https://www.howtogeek.com/this-is-my-favorite-network-security-app-on-linux/

Explorer Tab Utility

Explorer Tab Utility is a free add-on to offer additional functionality to Windows Explorer.

https://github.com/w4po/ExplorerTabUtility

Winhance

Winhance is a PowerShell utility for optimizing and customizing Windows 11.

https://4sysops.com/archives/optimize-and-customize-windows-11-with-powershell-and-winhance/

https://github.com/memstechtips/Winhance

LosslessCut

LosslessCut is a free multi-platform video editor.

https://mifi.no/losslesscut/

Buttercup

Buttercup is a password manager that has multi-platform support.

https://buttercup.pw/

Nativefier

Nativefier is an utility that creates desktop apps out of web pages while separating them from browsers into their own processes.

https://github.com/nativefier/nativefier

https://www.howtogeek.com/turn-any-website-into-a-standalone-app-with-nativefier-and-why/

ddgr

ddgr is a command-line tool for Linux that allows searches via DuckDuckGo.

The application can be installed within Linux Mint using the following command:

sudo apt install ddgr

https://github.com/jarun/ddgr

https://www.howtogeek.com/this-linux-tool-lets-you-search-duckduckgo-in-the-terminal/

TSforge

TSforge is an utility to activate Windows and Office products.

https://github.com/massgravel/TSforge

https://massgrave.dev/blog/tsforge

WinScript

WinScript is an open-source utility to help build custom scripts for Windows 10 and 11. It includes debloat, privacy, and performance scripts.

https://github.com/flick9000/winscript

https://4sysops.com/archives/debloat-windows-11-with-winscript/

Filelight

Filelight is an application to visualize the disk usage on your computer.  It is available for Windows, MacOS, and Linux.

https://apps.kde.org/filelight/

Zettlr

Zettlr is an open-source application for notes.  The notes are stored as Markdown files.

https://zettlr.com

Parabolic

Parabolic is a graphic front-end for the yt-dlp application.  The yt-dlp program can download videos from various sites such as YouTube.

https://github.com/NickvisionApps/Parabolic

Obtainium

Obtainium is an app for Android that will update other apps per the source.  Potential sources could be Github and F-Droid.

https://github.com/ImranR98/Obtainium 

Ntopng

Ntopng is utility for monitoring traffic on a network. It is designed to be a high-performance/low-resource replacement for ntop.

https://github.com/ntop/ntopng

https://www.ntop.org/products/traffic-analysis/ntop/

Seal APK

Seal AKP is an app for Android that allows media downloads from certain services such as YouTube.

https://sealapk.net/

Block breaker game via Google Search

Google search has released a block breaker game that is free.

CotEditor

CotEditor is a free open-source plain-text editor for macOS.

https://coteditor.com/

Azure Pricing Calculator

Azure Pricing Calculator is a tool designed to simplify cost estimation across over 100 Azure services.

https://azure.microsoft.com/en-us/pricing/calculator/

https://petri.com/azure-pricing-calculator/

Jupyter

Jupyter is a "notebook interface" that lets you create "literate programs," programs that mix code with explanatory text.

https://jupyter.org/

https://www.howtogeek.com/how-to-get-started-creating-interactive-notebooks-in-jupyter/

Jocala Software

The adbLink and adbLink2 applications manage connections between your Android devices and your computer. adbLink includes extra functionality for managing Kodi installations.

http://jocala.com

Invidious

Invidious is an alternative interface for YouTube.

https://redirect.invidious.io/

https://github.com/iv-org/invidious

IINA

IINA is an free media player for MacOS.

https://iina.io/

Microsoft Cloud Group Analyzer

Microsoft Cloud Group Analyzer is a script to highlight the group memberships within an Entra environment.

https://github.com/jasperbaes/Microsoft-Cloud-Group-Analyzer

https://practical365.com/a-practical-tool-to-prevent-misuse-of-entra-group-assignment/