Best Open Source Cybersecurity Tools 2025

Cybersecurity Tools

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Browse free open source Cybersecurity tools and projects below. Use the toggles on the left to filter open source Cybersecurity tools by OS, license, language, programming language, and project status.

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Monitoring, Securing, Optimizing 3rd party scripts
For developers looking for a solution to monitor, script, and optimize 3rd party scripts

c/side is crawling many sites to get ahead of new attacks. c/side is the only fully autonomous detection tool for assessing 3rd party scripts. We do not rely purely on threat feed intel or easy to circumvent detections. We also use historical context and AI to review the payload and behavior of scripts.

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1

Discord Message Spammer

Discord chat spammer

easy to use, set the tokens & channels and have fun, don't use it in a bad way if you catch my drift, if you want to use it you better use a vpn so discord won't ban you're ip smh. DMS version 0.3 ill keep updating this tool for sure license By downloading this, you agree to the Commons Clause license and that you're not allowed to sell this repository or any code from this repository. For more info see https://commonsclause.com/. my discord server: https://discord.gg/MJu44Kdh

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Downloads: 21 This Week

Last Update: 2025-07-17
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2

RTFn

Rock the Flag network (RTFn), is a set of services that allow you to better collaborate. The intended use is for information/cyber-security related capture the flag or war games. The main driver behind RTFn is a modified Etherpad installation. Now located on github! https://github.com/theopolis/RTFn-lite

Downloads: 1 This Week

Last Update: 2012-05-19
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3

Plum Harbor Deutsch

German version of the "Plum Harbor" file sharing app.

Eine experimentelle Dateifreigabe App, die mit Next.js und Perplexity entwickelt wurde und es den Nutzern ermöglicht, Dateien einfach zu teilen, zu empfangen, zu senden und erneut zu senden. Die App verwendet ML-KEM-1024, ChaCha20, Serpent-256 und HMAC-SHA512, um die Vertraulichkeit und Integrität der Daten zu gewährleisten. Außerdem ist die App mit einem speziellen Passwortspeicher ausgestattet. Schau es dir an unter: https://plum-harbor-deutsch.netlify.app/ GitHub: https://github.com/Northstrix/plum-harbor-deutsch Codeberg: https://codeberg.org/Northstrix/plum-harbor-deutsch English Version: Deployed app: https://plum-harbor.netlify.app/ SourceForge: https://sourceforge.net/projects/plum-harbor/ GitHub page: https://github.com/Northstrix/plum-harbor Codeberg page: https://codeberg.org/Northstrix/plum-harbor

Downloads: 0 This Week

Last Update: 2024-11-27
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