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

  • Enterprise-grade ITSM, for every business Icon
    Enterprise-grade ITSM, for every business

    Give your IT, operations, and business teams the ability to deliver exceptional services—without the complexity.

    Freshservice is an intuitive, AI-powered platform that helps IT, operations, and business teams deliver exceptional service without the usual complexity. Automate repetitive tasks, resolve issues faster, and provide seamless support across the organization. From managing incidents and assets to driving smarter decisions, Freshservice makes it easy to stay efficient and scale with confidence.
    Try it Free
  • Find Hidden Risks in Windows Task Scheduler Icon
    Find Hidden Risks in Windows Task Scheduler

    Free diagnostic script reveals configuration issues, error patterns, and security risks. Instant HTML report.

    Windows Task Scheduler might be hiding critical failures. Download the free JAMS diagnostic tool to uncover problems before they impact production—get a color-coded risk report with clear remediation steps in minutes.
    Download Free Tool
  • 1
    HiJackThis

    HiJackThis

    A free utility that finds malware and other threats

    -- WARNING -- HiJackThis is an inactive project and it is not updated anymore. You may want to look at the existent unofficial forks though: https://github.com/dragokas/hijackthis/ -- HijackThis is a free utility that generates an in depth report of registry and file settings from your computer. HijackThis scan results make no separation between safe and unsafe settings , which gives you the ability to selectively remove items from your machine. In addition to scan and remove capabilities, HijackThis comes with several useful tools to manually remove malware from your computer. However, HijackThis does not make value based calls between what is considered good or bad. It is important to exercise caution and avoid making changes to your computer settings, unless you have expert knowledge. Source code is available SourceForge, under Code and also as a zip file under Files.
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    Downloads: 731 This Week
    Last Update:
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  • 2
    IPCop Firewall

    IPCop Firewall

    Linux firewall distribution geared towards home and SOHO users.

    The IPCop Firewall is a Linux firewall distribution. It is geared towards home and SOHO users. The IPCop web-interface is very user-friendly and makes usage easy.
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    Downloads: 103 This Week
    Last Update:
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  • 3
    Open source DKIM library, MTA filter implementation and associated tools.
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    Downloads: 107 This Week
    Last Update:
    See Project
  • 4

    GnuPG for OS X / macOS

    GnuPG 2.2, 2.3 and 2.4 distributions for OS X / macOS

    This project was retired on 2025-03-30, see the documentation section.
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    Downloads: 296 This Week
    Last Update:
    See Project
  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • 5
    FreeOTFE

    FreeOTFE

    A free "on-the-fly" transparent disk encryption program for PC & PDAs.

    An upstream source site housing the original files for this mirror is no longer available. With this software, you can create one or more "virtual disks" on your PC/PDA. These disks operate exactly like a normal disk, with the exception that anything written to one of them is transparently, and securely, encrypted before being stored on your computer's hard drive.
    Downloads: 9 This Week
    Last Update:
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  • 6
    Open1X is an open source implementation of the IEEE 802.1X protocol. This project includes support for the supplicant, while other projects (e.g., FreeRADIUS) provide support for the authentication server.
    Downloads: 6 This Week
    Last Update:
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  • 7
    SSL-Explorer is a fully-featured, web-based SSL VPN server. This project is no longer actively maintained as the SSL-Explorer technology has now been acquired by Barracuda Networks, Inc.
    Downloads: 4 This Week
    Last Update:
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  • 8
    This project is a C++ library which allows incorporating DKIM into an existing MTA or other application. It provides full support for signing, verifying, and SSP. It is compliant with RFC 4871.
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    Downloads: 6 This Week
    Last Update:
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  • 9
    KeyCounter is a tool for the tray-bar that helps you to get statistics about the useage of your computers keyboard, mouse and uptime. KeyCounter is not intended to work as a keylogger.
    Downloads: 7 This Week
    Last Update:
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  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 10
    SecSy: Security-oriented Log Synthesis

    SecSy: Security-oriented Log Synthesis

    Tool for synthesizing business process logs.

    SecSy is a tool for security-oriented log synthesis. Besides basic synthesis properties (cases per day, office hours, randomized activity duration, ...), its detailed parameter setting for simulating business processes also allows to specify data usage (objects + access modality), actors for process activities and access control constraints for task/object permissions. It is also capable of enforcing/violating specific security properties on process traces, such as SoD/BoD, Unauthorized Access, Corrupted log entries, Skipped Activities. SecSy builds upon the following libraries, that have to be included in the projects' build path: - JAGAL: http://sourceforge.net/p/jagal - JAWL: http://sourceforge.net/p/jawl - SEPIA: http://sourceforge.net/p/sepiaframework - SERAM: http://sourceforge.net/p/seram - TOVAL: http://sourceforge.net/p/toval
    Downloads: 6 This Week
    Last Update:
    See Project
  • 11
    Start Menu Cleaner organizes your links in the Windows Start Menu. It also have many functions to maintain security and performances of your Windows system (services, autorun...).
    Downloads: 5 This Week
    Last Update:
    See Project
  • 12
    vstegfs has moved to http://sourceforge.net/projects/stegfs
    Downloads: 4 This Week
    Last Update:
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  • 13
    FTP-over-SSL/TLS Plugin for Total Commander. (Based on ACE & wxWidgets)
    Downloads: 3 This Week
    Last Update:
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  • 14
    LavaRnd is a random number generator that converts a digitized chaotic source (such as a lens capped web camera) into cryptographically strong random numbers. LavaRnd comes with both an APIs (currently C and Perl) as well as a number of demos.
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    Downloads: 3 This Week
    Last Update:
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  • 15
    The Program Killer is a Delphi 6 program that monitors the Process List on Windows 95/98/Me and Windows NT4/2000/XP for unauthorized EXE files (User Definable) and if found, those Processes are Terminated via the Windows API.
    Downloads: 3 This Week
    Last Update:
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  • 16
    Caditor is a portable tabbed text editor featuring encryption, syntax highlighting, autocomplete, line numbering and a functional plugin system.
    Downloads: 1 This Week
    Last Update:
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  • 17
    This project is an attempt at a decent and user friendly password generator, that will integrate itself into the user's everyday work!
    Downloads: 2 This Week
    Last Update:
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  • 18
    Cryptex
    Cryptex is a fast and simple easy to use open source software for encryption and decryption of files and folders. The software has a proprietary format for password management. Cryptex use AES and TripleDES algorithms.
    Downloads: 2 This Week
    Last Update:
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  • 19

    Orca AntiVirus

    Orca antivirus for Windows PC, virus and malware cleaner

    Free antivirus for Windows PC, speeds up Windows PC and laptop. Orca antivirus is made to work on all versions of windows above Windows Vista and is capable of detecting viruses and malware. Orca antivirus does not offer any premium and is 100% free
    Downloads: 2 This Week
    Last Update:
    See Project
  • 20
    Distributed John is a distributed password cracking using John The Ripper. It consists of a server that handles work to the clients (each on a different machine), which use John the Ripper.
    Downloads: 1 This Week
    Last Update:
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  • 21
    A linux distribution for Wardrivers. It is available on disk and bootable CD. It's main intended use is for systems administrators that want to audit and evaluate thier wireless network installations. Should be handy for wardriving also.
    Downloads: 1 This Week
    Last Update:
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  • 22
    Arcanum Editor
    The Arcanum Editor is a small but powerful tool to encrypt and decrypt messages. The program also comes with it's own format CTXT. This format is based on XML and allows you to save texts with the Advanced Encryption Standard.
    Downloads: 1 This Week
    Last Update:
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  • 23
    Open source antivirus developed in C++. Detects and eliminates viruses, trojans, worms, adware, spyware, rootkits, also protects against phising attempts and network attacks.
    Downloads: 1 This Week
    Last Update:
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  • 24
    - DSI is a security framework addressing security needs of carrier-grade Linux clusters. - DigSig is a linux kernel module checking RSA signatures of ELF executables at run-time. **Those projects are no longer maintained**
    Downloads: 1 This Week
    Last Update:
    See Project
  • 25
    EIDNative Library is a freeware SDK for Belgian Electronic ID Card. EIDNative Library includes native API for: * Microsoft .NET * Native Win32 * Visual Basic 6.0 and VBA * Java (only Windows platform)
    Downloads: 1 This Week
    Last Update:
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