Open Source C Business Software

TurboVNC is a high-performance, enterprise-quality version of VNC based on TightVNC, TigerVNC, and X.org. It contains a variant of Tight encoding that is tuned for maximum performance and compression with 3D applications (VirtualGL), video, and other image-intensive workloads. TurboVNC, in combination with VirtualGL, provides a complete solution for remotely displaying 3D applications with interactive performance. TurboVNC's high-speed encoding methods have been adopted by TigerVNC and libvncserver, and TurboVNC is also compatible with any other TightVNC derivative. TurboVNC forked from TightVNC in 2004 and still covers all of the TightVNC 1.3.x features, but TurboVNC contains numerous feature enhancements and bug fixes relative to TightVNC, and it compresses 3D and video workloads much better than TightVNC while using generally only 5-20% of the CPU time of the latter. Using non-default settings, TurboVNC can also be made to compress 2D workloads as "tightly" as TightVNC.

VirtualGL redirects 3D commands from a Unix/Linux OpenGL application onto a server-side GPU and converts the rendered 3D images into a video stream with which remote clients can interact to view and control the 3D application in real time.

GnuWin provides Win32-versions of GNU tools, or tools with a similar open source licence. The ports are native ports, relying only on libraries provided with any modern 32-bits MS-Windows operating system, such as 2000 / XP / Vista / 7

A famous scientific plotting package, features include 2D and 3D plotting, a huge number of output formats, interactive input or script-driven options, and a large set of scripted examples.

Maxima is a computer algebra system comparable to commercial systems like Mathematica and Maple. It emphasizes symbolic mathematical computation: algebra, trigonometry, calculus, and much more. For example, Maxima solves x^2-r*x-s^2-r*s=0, giving the symbolic results [x=r+s, x=-s]. It can also calculate with exact integers and fractions, native floating-point, and high-precision big floats. Maxima has user-friendly front-ends, an online manual, plotting commands, and numerical libraries. It features its own programming language, and many users have contributed useful packages in various areas over the decades. It is GPL-licensed and largely written in Common Lisp. Executables can be downloaded for Windows, Mac, Linux, and Android; source code is also available. An active community maintains and extends the system. Website: https://maxima.sourceforge.io Additional add-on packages for Maxima can be found at: https://github.com/maxima-project-on-github/maxima-packages

GnuCash is a personal and small-business finance manager with a check-book like register GUI to enter and track bank accounts, stocks, income and expenses. GnuCash is designed to be simple and easy to use but still based on formal accounting principles.

FreeImage is a library project for developers who would like to support popular graphics image formats (PNG, JPEG, TIFF, BMP and others). Some highlights are: extremely simple in use, not limited to the local PC (unique FreeImageIO) and Plugin driven!

Technical analysis library with indicators like ADX, MACD, RSI, Stochastic and TRIX, plus candlestick pattern recognition. Docs: https://ta-lib.org Available natively in C/C++, Java, Rust and C# with wrappers for python, R and many other ecosystems. MOVED TO GITHUB: https://github.com/TA-Lib/ta-lib . No further support is provided on SourceForge. Release 0.4.0 is very outdated, please check github for the most recent release.

Pandora OPEN is a high-performance, 100% open-source monitoring ecosystem, born as the independent evolution of the Pandora FMS community branch after version 777. Licensed under GPLv2, it provides a modular and sovereign platform for supervising networks, servers, and applications without commercial dependencies. It features multi-platform agents, remote monitoring (SNMP, WMI, HTTP), GIS maps, and advanced visual dashboards. Entirely maintained by the community on GitHub, it ensures total transparency, technical flexibility, and absolute freedom for system administrators.

The AbiWord word processor is a full-featured cross-platform word processor.

Encodes data into any of the following: Australia Post, Aztec Code & Runes, BC412, Channel, Codabar, Codablock-F, Code 11, Code 128, Code 16K, Code 2 of 5 (incl. IATA, Interleaved, Data Logic, ITF-14, Deutsche Post Leitcode & Identcode), Code 32 (Italian Pharmacode), Code 39, Code 39+, Code 49, Code 93, Code One, DAFT, Data Matrix (incl. DMRE), DotCode, DPD, Dutch Post KIX, EAN, FIM, Flattermarken, Grid Matrix, GS1 DataBar (incl. stacked & GS1 Composite symbols), GS1-128, Han Xin, HIBC, ISBN, Japan Post, Korea Post, LOGMARS, MaxiCode, NVE-18 ( SSCC-18), PDF417 & MicroPDF417, Pharmacode, PLANET, POSTNET, Plessey (MSI & UK), PZN, QR Code, Micro QR & rMQR, Royal Mail RM4SCC & Mailmark, Telepen, Ultracode, UPC-A, UPC-E, UPNQR, UPU S10, USPS Intelligent Mail and VIN. Automated ECI switching to support all Unicode characters and automated FNC1 character insertion in GS1 mode. Save to BMP, EMF, EPS, GIF, PCX, PNG, SVG and TIF. Includes CLI, GUI and API for calling from other applications.

Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) viewer for Windows. Sumatra PDF is powerful, small, portable and starts up very fast. Simplicity of the user interface has a high priority. Portable version is a single executable, can be run from USB drive and doesn't write to registry. For best results use the latest release available as that's what I use and test with. If things don't compile, first make sure you're using the latest version of Visual Studio. To compile you need Visual Studio 2019 16.6 or later. Free Community edition works.

Grisbi is a very functional personal financial management program with a reasonable set of homefinance features.

Luminance HDR is a complete suite for HDR imaging workflow. It provides a wide range of functionalities, during both the fusion stage and the tonemapping stage. Its graphical user interface, based on Qt5, runs on a variety of platforms, such as Microsoft Windows, Mac OS X 10.9 and later and several Unix flavors (Linux, FreeBSD and others). Input images can be supplied in multiple formats, from JPEG to RAW files. In the same way, output can be saved in many different formats as well, from JPEG to TIFF (both 8 bit and 16 bit per channel), enabling all the power of your post processing tools.

XTrackCAD is a open-source, free, CAD program for designing model railroad layouts. You can easily create layout of any scale or size. Libraries for many brands, scales and gauges of track and turnouts/points and model structures are included. Adding new components is easy with the built-in editor. It runs on Windows, Mac and Linux,