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

  • Your top-rated shield against malware and online scams | Avast Free Antivirus Icon
    Your top-rated shield against malware and online scams | Avast Free Antivirus

    Browse and email in peace, supported by clever AI

    Our antivirus software scans for security and performance issues and helps you to fix them instantly. It also protects you in real time by analyzing unknown files before they reach your desktop PC or laptop — all for free.
    Free Download
  • 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
  • 1
    KeePass

    KeePass

    A lightweight and easy-to-use password manager

    KeePass Password Safe is a free, open source, lightweight, and easy-to-use password manager for Windows, Linux and Mac OS X, with ports for Android, iPhone/iPad and other mobile devices. With so many passwords to remember and the need to vary passwords to protect your valuable data, it’s nice to have KeePass to manage your passwords in a secure way. KeePass puts all your passwords in a highly encrypted database and locks them with one master key or a key file. As a result, you only have to remember one single master password or select the key file to unlock the whole database. And the databases are encrypted using the best and most secure encryption algorithms currently known, AES and Twofish. See our features page for details.
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    Downloads: 1,116,201 This Week
    Last Update:
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  • 2
    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server implements multiple spam filters

    The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24261. A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2 are also available for download. NOTICE: V1 development has been stopped at the end of 2014 (1.10.1 build 16060). Possibly there will be done some bugfixing in future. Please upgrade to V2, which is and will be actively maintained.
    Leader badge
    Downloads: 48,474 This Week
    Last Update:
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  • 3
    Cntlm is an NTLM / NTLMv2 authenticating HTTP/1.1 proxy. It caches auth'd connections for reuse, offers TCP/IP tunneling (port forwarding) thru parent proxy and much much more. It's in C, very fast and resource-efficient. Go to http://cntlm.sf.net/
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    Downloads: 668 This Week
    Last Update:
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  • 4
    AWStats

    AWStats

    AWStats Log Analyzer

    AWStats is a free powerful and featureful server logfile analyzer that shows you all your Web/Mail/FTP statistics including visits, unique visitors, pages, hits, rush hours, os, browsers, search engines, keywords, robots visits, broken links and more
    Leader badge
    Downloads: 298 This Week
    Last Update:
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  • Build Securely on Azure with Proven Frameworks Icon
    Build Securely on Azure with Proven Frameworks

    Lay a foundation for success with Tested Reference Architectures developed by Fortinet’s experts. Learn more in this white paper.

    Moving to the cloud brings new challenges. How can you manage a larger attack surface while ensuring great network performance? Turn to Fortinet’s Tested Reference Architectures, blueprints for designing and securing cloud environments built by cybersecurity experts. Learn more and explore use cases in this white paper.
    Download Now
  • 5
    FileVerifier++
    FileVerifier++ is a Windows utility for calculating hashes using a number of algorithms including CRC32, MD5, SHA-1, SHA-256/224/384/512, WHIRLPOOL, and RIPEMD-128/160/256/320. Supported hash file formats include MD5SUM .MD5, SFV, BSD CKSUM, and others.
    Downloads: 43 This Week
    Last Update:
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  • 6
    The goal of Operation Project X is to crack the 2048-bit RSA private encryption key Microsoft uses to sign Xbox media, by using distributed computing. This key could be used by Xbox owners to run homebrew code on their machines.
    Downloads: 39 This Week
    Last Update:
    See Project
  • 7
    NewPKI is a PKI based on the OpenSSL low-level API, all the datas are handled through a database, which provides a much more flexible PKI than with OpenSSL, such as seeking a certificate with a search engine.
    Downloads: 34 This Week
    Last Update:
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  • 8
    File system/directory monitoring utilities with loggin and task processing support (can execute files or make a WCF service call). Multiple configuration options. Source code libraries can be used to create a custom file system monitor.
    Downloads: 6 This Week
    Last Update:
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  • 9
    The purpose of the tool is to perform fingerprinting of remote TCP/IP stacks based on Ofir Arkin's ICMP fingerprinting research. This tool is a practical implementation of results discovered during 'project X' http://www.sys-security.com/index.php
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    Downloads: 12 This Week
    Last Update:
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  • MongoDB Atlas | Run databases anywhere Icon
    MongoDB Atlas | Run databases anywhere

    Ensure the availability of your data with coverage across AWS, Azure, and GCP on MongoDB Atlas—the multi-cloud database for every enterprise.

    MongoDB Atlas allows you to build and run modern applications across 125+ cloud regions, spanning AWS, Azure, and Google Cloud. Its multi-cloud clusters enable seamless data distribution and automated failover between cloud providers, ensuring high availability and flexibility without added complexity.
    Learn More
  • 10
    mac-robber is a digital forensics and incident response tool that can be used with The Sleuth Kit to create a timeline of file activity for mounted file systems.
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    Downloads: 12 This Week
    Last Update:
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  • 11
    Logsurfer is a program for monitoring system logs in real-time, and reporting on the occurrence of events. It is capable of grouping information together to enhance loganalysis and create automatic reports.
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    Downloads: 9 This Week
    Last Update:
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  • 12
    A resource-conscientious, flexible, modular, platform-independent, scalable and robust server based on ircd-ratbox.
    Downloads: 16 This Week
    Last Update:
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  • 13
    Privacy and Anonymity in the Internet

    Privacy and Anonymity in the Internet

    System for anonymous Web browsing

    Our goal is to develop, implement, evaluate and provide a secure and scaleable technical infrastructure for anonymous communication. This project is supported by Deutsche Forschungsgemeinschaft (DFG).
    Downloads: 5 This Week
    Last Update:
    See Project
  • 14
    IBM's Software Trusted Platform Module (TPM) includes a TPM 1.2 implementation, low level demo libraries and command line tools, a TPM test suite, and proxies to connect from a TCP/IP socket to a hardware TPM. tpm4769 is the latest version, with TPM side support for OpenSSL 1.1. The utilities and test suite have not been ported to OpenSSL 1.1. They remain at 1.0. For the SW TPM 2.0, see https://sourceforge.net/projects/ibmswtpm2/. TPM 1.2 and TPM 2.0 are not software compatible.
    Leader badge
    Downloads: 12 This Week
    Last Update:
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  • 15
    Access Point Utilites for Unix - it's a set of utilites to configure and monitor Wireless Access Points under Unix using SNMP protocol. Utilites knownly compiles and run under Linux, FreeBSD, NetBSD, OpenBSD, MacOS-X, AIX, QNX.
    Downloads: 10 This Week
    Last Update:
    See Project
  • 16
    The OVAL Interpreter is a freely available reference implementation that demonstrates the evaluation of OVAL Definitions. Based on a set of OVAL Definitions the interpreter collects system information, evaluates it, and generates a detailed OVAL Results file. Developed to demonstrate the usability of OVAL Definitions and to ensure correct syntax and adherence to the OVAL Schemas by definition writers, it is not a fully functional scanning tool nor an enterprise scanning tool. It is a simplistic, command-line application that has the ability to execute OVAL Content on an end system. To learn more about organizations that provide OVAL content and tools or otherwise support the OVAL Language, please see the OVAL Adoption Program (http://oval.mitre.org/adoption/).
    Leader badge
    Downloads: 2 This Week
    Last Update:
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  • 17
    Output spool reader for Snort! This program decouples output overhead from the Snort network intrusion detection system and allows Snort to run at full speed. It takes input and output plugins and can therefore be used to convert almost any spooled fil
    Downloads: 2 This Week
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  • 18
    ClamSAP exists of two 'C' shared libraries which link between ClamAV and the Virus Scan Interface (VSI) of SAP (offical name: NW-VSI). A SAP application can use the ClamAV engine to scan for malicious uploads in HTTP uploads for example.
    Downloads: 7 This Week
    Last Update:
    See Project
  • 19
    siggen is a cool email signature generator for encrypted ansi c (confused), brainf*ck, ... signatures. Use it in combination with vi(m), emacs, mutt, pine, or what ever. (tested on Solaris, Linux and Windoze). Optimized only for geeks :-)
    Downloads: 3 This Week
    Last Update:
    See Project
  • 20
    dk-milter consists of two parts: A milter-based application (dk-filter) which plugs in to Sendmail to provide DomainKeys service, and a library (libdk) which can be used to build DomainKeys-compliant applications or MTAs. See the home page for details.
    Downloads: 5 This Week
    Last Update:
    See Project
  • 21
    psyBNC is an easy-to-use, multi-user, permanent IRC-Bouncer with many features. Some of its features include symmetric ciphering of talk and connections (Blowfish and IDEA) It compiles on Linux, FreeBSD, SunOs and Solaris.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 22
    OW.NET -- 1-Wire API port from Java (and J#) to C#. Use the Dallas 1-Wire and iButton chips with standard C# using a serial adapter (also CF.net) or the TMEX drivers on the Windows platform. No J# distribution installation required.
    Downloads: 2 This Week
    Last Update:
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  • 23
    Tyrant SQL

    Tyrant SQL

    Tyrant SQL is a Havij based cross-platform. It's Sqlmap's gui version.

    It's a poweful Sql Injection Tool. It's a GUI version of SqlMap, saving time and getting better results. Was designed basing on Havij.
    Downloads: 2 This Week
    Last Update:
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  • 24
    Set of tools and libs for managing structured data in a very flexible way: Imp./Exp. ASCII, XML, SQL, PS, Tex/LaTex, RTF GUI: X-Windows, MS-Windows Interface to C++, DBs, Perl, PHP, Java, TCP/IP LISP-like interpreter written in C++ using C-LIB
    Downloads: 2 This Week
    Last Update:
    See Project
  • 25
    Open source DRM for MPEG-4 and MPEG-2 adhering to ISO/MPEG IPMP open standards (MPEG IPMP Hooks and IPMP-X), ISMAcryp and OMA DRM 2 specs. Includes CA, PKI, DOI mgmt, ISMA streaming, license server, encoding/encryption, player, plugin architecture, etc
    Downloads: 1 This Week
    Last Update:
    See Project
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