A free and reliable P2P BitTorrent client
An advanced and multi-platform BitTorrent client with a nice Qt user interface as well as a Web UI for remote control and an integrated search engine. qBittorrent aims to meet the needs of most users while using as little CPU and memory as possible.
A graphical text difference analyzer
KDiff3 is a graphical text difference analyzer for up to 3 input files, provides character-by-character analysis and a text merge tool with integrated editor. It can also compare and merge directories. Platform-independant.
DjVu is a web-centric format for distributing documents and images. DjVu was created at AT&T Labs-Research and later sold to LizardTech Inc. DjVuLibre is a GPL implementation of DjVu maintained by the original inventors of DjVu.
A planetarium software that shows a 3D simulation of the night sky
Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets, nebulae and others things like ground, landscape, atmosphere, etc.
An advanced drum machine with pattern-based programming
Hydrogen is an advanced drum machine for GNU/Linux, Windows and Mac OS X. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.
a parametric 3D CAD modeler
WARNING: FreeCAD has moved! FreeCAD code and release files are now hosted on github at https://github.com/FreeCAD/FreeCAD Only older files and code are available here. FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. It is 100% Open Source and extremely modular, allowing for very advanced extension and customization. FreeCAD is based on OpenCasCade, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. The interface is built with Qt. FreeCAD runs exactly the same way on Windows, Mac OSX and Linux platforms.
Python Development Environment with all batteries included
Eric is a Python IDE written using PyQt and QScintilla. It provides various features such as any number of open editors, an integrated (remote) debugger, project management facilities, unit test, refactoring and much more.
An intuitive molecular editor and visualization tool
Avogadro is an advanced molecular editor designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science and related areas. It offers a flexible rendering framework and a powerful plugin architecture.
The best free media player for video and DVDs
VLC is an open source cross-platform multimedia player and framework, which plays most multimedia files, DVDs, Audio CDs, VCDs, and various streaming protocols. VLC media player is simple, fast, and powerful. It plays everything, files, discs, webcams, devices, and streams. VLC plays most codecs (MPEG-2, DivX, H.264, MKV, WebM, WMV, MP3, etc.) so no codec packs are needed. It runs on all platforms: Windows, Linux, Mac OS X, Unix, etc. And VLC is hassle free with no spyware, no ads, and no user tracking.
Audio Tag Editor
Kid3 audio tag editor can edit the tags of MP3, Ogg, FLAC, MPC & WMA files in an efficient way, convert between ID3v1 and ID3v2, set the tags of multiple files, generate tags from file names or vice versa and import from freedb, MusicBrainz and Disco
Free editor for PDF documents. Complete editing of PDF documents is possible with PDFedit. You can change raw pdf objects (for advanced users) or use many gui functions. Functionality can be easily extended using a scripting language (ECMAScript).
You can message and share files inside your intranet without a server.
BeeBEEP is a secure (encryption based on Rijndael Algorithm, AES) peer to peer lan messenger. You can talk and send files with all your friends inside a local area network such of an office, home or internet cafe without a server. For more info visit: http://beebeep.sourceforge.net
Doxygen is a JavaDoc like documentation system for C++, C, Java and IDL.
A barcode encoding library supporting over 50 symbologies.
Encodes data into any of the following: Australia Post barcode, Aztec Code, Aztec Runes, Channel Code, Codabar, Codablock-F, Code 11, Code 128, Code 16K, Code 2 of 5 (Including IATA, Datalogic, ITF14, Deutsche Post Leitcode and Identcode), Code 32 (Italian Pharmacode), Code 39, Code 39+, Code 49, Code 93, Code One, Data Matrix (ECC200), DotCode, Dutch Post KIX, EAN, Grid Matrix, GS-1 DataBar, Han Xin Code, HIBC, Japan Post, Korea Post, LOGMARS, MaxiCode, MSI, PDF417 and Micro PDF417, Pharmacode, POSTNET, PLANET, QR Code and Micro QR, Royal Mail 4-state (RM4SCC) and Mailmark, Telepen, UPC-A and UPC-E, UPNQR and USPS Intelligent Mail. Also supports full range of Unicode (UTF8) input using automated ECI switching for encoding in multiple languages and GS-1 data input mode. Save to PNG, BMP, TIF, GIF, PCX, SVG, WMF and EPS output file formats. Includes CLI and GUI interfaces and fully documented API for integrating with other projects.
Synkron is a simple Qt application that allows you to sync folders, for example a flash disk with a folder on your hard disk.
Editors for the BOSS GT-3, 5, 6, 8, Pro, 10, 100, 001 Guitar Multi-Effects Processors, and the BOSS GT-6B,10B Bass Multi-Effects Processors. And for the Katana modelling Amplifier. This software can edit patches via midi on the BOSS Multi-Effects/AmpProcessor.
PAGE is a drag-and-drop GUI generator for Python and Tkinter which generates Python modules which display a relatively simple GUI constructed from Tk and ttk widget sets using the Place Geometry Manager. PAGE runs on any OS which has Tcl/Tk installed. PAGE output requires only Python and Tkinter and runs on Linux, Unix, Windows, OS X, and even Rasperian.
2D Animation Tool for Children and Teenagers
TupiTube Desk is a 2D animation tool for desktop environments focused on usability for children and amateur artists. It is available for Windows, Mac and Linux operating systems
Free Zip software and Rar extractor
PeaZip is a free archiver tool. The application provides an unified, natively portable, cross-platform file manager and archive manager GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX. Create: 7Z, ARC, BZip/GZip, PEA, TAR, WIM, XZ, ZPAQ, ZIP files and more Open and extract 180+ file types: ACE, CAB, DEB, ISO, RAR, ZIPX and more Features of PeaZip includes extract, create and convert multiple archives at once, create self-extracting archives (sfx), split files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hashes, export task definition as command line script. ACE file extraction needs separate installation of free (but not Open Source, due original format licensing restrictions) UNACE Plugin, available on Add-ons page of PeaZip website. Due the closed-source nature of this component, it has been separated from the main package, which contains only Open Source components.
DJV Imaging provides open source movie playback software for use in film production, VFX, and computer animation.
BASIC-256 is an easy to use version of BASIC designed to teach anybody how to program. A built-in graphics mode lets them draw pictures on screen in minutes, and a set of easy-to-follow tutorials introduce programming concepts through fun exercises.
GPX viewer and analyzer
GPXSee is a GPS log file viewer and analyzer that supports GPX, TCX, KML, FIT, IGC, NMEA and OziExplorer files.
projectM, a MilkDrop compatible opensource music visualizer
projectM is an OpenGL based advanced music visualization program for Linux, Mac OSX, and Windows. It is backward compatible with all the features of Milkdrop 1.x (and now 2.x), but has many new toys and enhancements.
Free music notation & composition software
MuseScore is the leading free & open source music notation software for Windows, Mac and Linux. It is easy to use and makes beautiful sheet music. MuseScore is often praised as a cost effective alternative for Sibelius and Finale. Support MuseScore at http://musescore.org/en/donate Like MuseScore on Facebook: http://facebook.com/musescore
Mnemosyne resembles a traditional flash-card program but with an important twist: it uses a sophisticated algorithm to schedule the best time for a card to come up for review.