Open Source Libraries

Cross-platform command-line tool for creation of PDF documents from scans/photos of pages in JPEG (.jpg) format and the lightest weight ANSI C library to put multiple JPEG files into one PDF file. You can add handwritten comments to PDF scans (over original images) with xournal: http://xournal.sourceforge.net/ It supports graphics tablets and saves comments to PDFs as vector data.

SigPack is a C++ signal processing library using the Armadillo library as a base. The API will be familiar for those who has used IT++ and Octave/Matlab.

JChart2D is a easy to use component for displaying two- dimensional traces in a coordinate system written in Java. It supports real-time (animated) charting, custom trace rendering, Multithreading, viewports, automatic scaling and labels. Former UI controls (right click context menu, file menu) have been ported to the subproject jchart2d-uimenu (https://sourceforge.net/projects/jchart2d-uimenu.jchart2d.p/) for the benefit of having no dependencies to 3rd party libraries.

Do you want a neural network OO class? With documentation? Do not go further... You found it! you have here a complete library of different neural network in an OO encapsulation. Starting from adaline, back propagation, Kohonen

Aleph-w is a library of data structures and algorithms implemented in and for C++. It contains the main data structures: single and double lists, special arrays (dynamic and of bits), many types of trees: multitrees, binary search trees, avl, red-black, randomized, treaps, splay and other interesting types. Several types of hash tables are implemented: separated chaining, open adressing with linear probing and double function hash; this last one has a garbage colector mechanism that allows to free deleted entries. Dynamic linear hash tables are implemented too. The main algorithms on graphs are implemented in an easy way and with good performance features. Network Flow (maximum and min cost), cut points, topological sort, spanning trees, min paths. etc. The graphs are generic in the sense that they can contain data independent of the algorithm. Several containers of the C++ STL library are implemented with Aleph-w. Their performance is better than GNU implementation

Seeds is a project which implements Data structure and Algorithms! We aim for speed, flexible and the easy to use!

The BioloidNativeInterface is a C++ library to control bioloid/dynamixel modules including AX12, AXS1. It provides a parser for the bioloid protocoll and methods to read/write packets.

Major looseless compression algorithms library and documentation. First project: Arithmetic, Huffman, LZ77, LZ78, LZW, RLE. Second project reimplements Deflate. Documentation explains major Entropy Compression Methods.

A small and simple library for reading and parsing MARC (bibliographic ISO-2709) records quickly. If you need to read and parse MRC files - it is that suits you.

LameUtils contails LameInts (large integer numbers signed and unsigned), LameStrings, and LameArray.

The package allows to work with scalar arrays as usual collections. The problem with a scalar array Java templates don't support scalar types as generic parameters. Java code working with collection interfaces such as List or Collection is inapplicable for arrays. Some libraries supply methods to work with object array. These methods are generic and built-in types int, boolean, long, short, byte, double, float suffer. The number of scalar type is small and finite. There are realization of Iterable, Iterator, Collection, and List interfaces for each scalar type. Also the library gives such useful methods as contains and indexOf for objects with Iterable interface only. Yeah. There is some stupidness because all implementations differ between each other only types and this code has 100% implicit coupling and duplications. But Java has not left other way.

Mahatma68k is a free/Open Source emulator library for the legendary Motorola 68000 CPU written for the Java virtual machine.

NeuronDotNet is a neural network engine written in C#. It provides an interface for advanced AI programmers to design various types of artificial neural networks and use them.

Numerikus is an attempt to build a set of numerical libraries written in C/C++, Fortran, Java and C# for single processor and multi-core processors. It wil have from basic functions to Linear Algebra solvers and ODE's and PDE's methods.

PHPProjectLibrary.is a tutorial driven PHP class library development project. It seeks to teach PHP class library development by combining the power of Open Source development with the skills of the Open Source community.

QtXGame is an intuitive, extensible, modern cross-platform tool to construct and solve extensive and strategic games related to Game Theory. Its extensibility allows user to create and add his own games, solvers and matrix transformations.

RELATED framework proposes a structured methodology of remote/virtual labs development and, also, provides common facilities as user management, booking, basic visualization (trend graphs and direct interaction using interactives variables), data logging and experimental session’s control. In order to get these facilities, an RLAB (Remote LABoratory) system it defined using a formal specification of a virtual or remote laboratory (based on XML and used to structure components for laboratory). The main component is experiment, so students could run these experiments using RELATED facilities as painting data from the laboratory, change any relevant variable or take a look on laboratory structure. In order to integrate a laboratory as an RLAB system, the researchers and lecturers only have to develop local access to equipment using Java technology, using the “module” paradigm.

This repository is a collection of small-to-medium React applications that showcase practical patterns, from stateful widgets to multi-page interfaces. Each project is self-contained and demonstrates specific techniques—hooks for state and effects, context for global state, custom hooks for reuse, and reducer patterns for complex updates. The codebases include common UI tasks like forms, modals, lists, filtered search, and pagination, along with data fetching and basic routing where appropriate. Because every project focuses on a narrow set of concepts, learners can clone a single folder, run it, and grasp the idea without wading through a monolith. The examples are structured to be approachable yet idiomatic, encouraging good habits while staying close to what developers actually build. Over time, the collection functions as a portfolio of reference implementations that students and practitioners can adapt to new projects.

The Scheme Natural Language Toolkit (S-NLTK) is a Scheme R6RS library for language and text processing, and various tasks related to symbolic and statistical analysis of language data.

TIKAPP is becoming a collection of tools for simulation of neural networks. The first available part is an ANSI-C++ library with support for backpropation networks.

TacoFancy is a collaborative cookbook built on Git, inviting everyone to submit taco recipes via pull requests. Instead of single monolithic recipes, it organizes the universe of tacos into modular parts—shells, proteins, salsas, toppings, and full assemblies—so you can mix and match to invent your own. The structure encourages creativity and reuse: a new salsa might pair with dozens of fillings, while a different tortilla technique can transform a favorite combination. Because it lives in Git, the entire cooking process becomes versioned and reviewable; contributors discuss tweaks in issues and iterate like they would on software. The repository is playful yet practical, spanning weeknight-simple ideas to elaborate, slow-cooked masterpieces, with plenty of vegetarian and regional twists. It’s as much a community project as it is a cookbook, showing how open source collaboration can make dinner more interesting.

The Data Engineering Handbook is a comprehensive, community-curated repository that aggregates essential learning resources for anyone interested in becoming a professional data engineer. Rather than being a code project itself, it’s a learning handbook that links to books, articles, tutorials, community groups, boot camps, and real-world project examples that collectively form a roadmap to mastering data engineering skills. It includes beginner and intermediate boot camps, interview guides, data cleaning and transformation resources, and curated lists of newsletters and industry communities, making it useful both for self-study and technical interview preparation. The repository is actively maintained and widely starred, reflecting its role as a go-to reference for newcomers and experienced practitioners alike.

VMatrixLib is a little, handy, Java matrix library which implements a set of utility functions (such as calculus of the determinant of a matrix, calculus of the rank, inverse matrix, and many others..) that anyone who have to use matrices needs.

Debby has replaced CDE in the Tina4Stack, you may want to check it out at http://tina4.com CDE is a PHP class which implements the general database functions in PHP and provides a common SQL platform for php development where developers change their databases but not their code. Supports Firebird, MySQL,Oracle,SQLite, MSSQL(both drivers),CUBRID,ODBC. CDE now supports date uniformity, param passing & BLOB handling across all the databases supported. CDE is not a replacement for PDO, in fact we may implement PDO in CDE to standardize PDO results and calls. Some PDO drivers are still regarded as EXPERIMENTAL on PHP website, so use with caution. Feel free to suggest any features you wish to be added or submit a bug report with the tracker

iText Programming Tutorials. Example code and detail explanation on how to generate Adobe PDF document with iText API. Example of AcroForm, bookmark, anchor, insert images, generate PDF with Java App, JSP or Servlet, create PDF table and etc.