I was asked to create this sticky, but it's something I'd also been thinking about doing for a while, being the open-source advocate I am. The ones I'll initially list are ones I've personally tested against other software and continue to use.


  • SourceForge - Comprehensive directory of open-source projects.
  • WEBI.ORG - Free and Open Source Software Directory.
  • Open Source Alternatives - Find open source software alternatives to well-known commercial software.
  • AlternativeTo - Provides a large list of open-source and other alternatives to popular commercial software.



Desktop Applications
  • LibreOffice - Office suite
  • OpenOffice - Office suite.
  • Notepad++ - Fully featured text editor with syntax highlighting.
  • PDFCreator - PDF creation software.
  • Electric Sheep - Psychadelic screensaver.
  • InfraRecorder - CD/DVD burning software.
  • StarDict - Cross-Platform and international dictionary Software. It has powerful features such as "Glob-style pattern matching", "Scan selection word," "Fuzzy query," etc.



Internet Browsers / Email Clients


FTP Clients


Image Manipulation / 3D Animation
  • The Gimp - Photoshop Equivalent.
  • Scribus - Desktop publishing. Equivalent to InDesign and QuarkXPress.
  • Inkscape - Vector illustration, equivalent to Illustrator, Freehand, Corel Draw and Xara X.
  • Paint.NET - Paint.NET is free image and photo editing software.
  • Blender 3D modeling/animation software.
  • POV-Ray - 3D modeling/animation software.



Video Tools
  • FFmpeg - Video conversion utility.
  • MediaCoder - Universal batch media transcoder.
  • VirtualDub - Basic editor, featured encoder.
  • VirtualDubMod - Basic editor, featured encoder.
  • HandBrake - DVD to MPEG-4 converter. Outputs to MP4, MKV, AVI or OGM.



Sound Editors / Rippers / Compression Tools


Compression & Backup
  • 7-Zip - Packs: 7z, ZIP, GZIP, BZIP2 and TAR. Unpacks: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS.
  • Cobian's Backup - Highly featured scheduled backup software, which supports a lot of features normally only found in commercial backup solutions.



Media Players
  • MediaPlayerClassic - With the right codecs, will play virtually anything and everything.
  • VLC Media Player - Natively supports a large range of video formats.
  • MPlayer - Natively supports a large range of video formats.
  • Songbird - Desktop Web player, a digital jukebox and Web browser mash-up.
  • aTunes - Audio player and manager.



Network Administration
  • Wireshark - Network analyzer previously known as Ethereal.
  • TightVNC - Simple remote access.
  • Ultr@VNC - More featured remote access.
  • Open Kiosk - Kiosk management system suited for use in controlled computing environments such as public access systems, libraries, school computer laboratories and internet cafes.
  • Putty - Telnet/SSH client.
  • OCS Inventory NG - Automated network inventory and deployment system.
  • Nmap - Network exploration or security auditing (port scanner).
  • BO2K - Remote control of systems, including network, registry, passwords, file system, and processes. Based on Back Orifice.



System Tools
  • ClamWin Free AntiVirus - (doesn't support on-access scanning yet)
  • Clonezilla - Drive cloning (like Ghost) and system deployment.
  • GParted - Hard disk partitioning...
  • Partition Logic - Hard disk partitioning and data management.
  • Rufus - A small utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc.
  • Synergy - Share a single mouse and keyboard between multiple computers with different operating systems, each with its own display, without special hardware. Imagine the functionality of dual monitors (expanded desktop) except each monitor is connected to a different computer.



Security


Personal Finance


Games / Simulators