The NIST STEP File Analyzer and Viewer (SFA) generates a spreadsheet and a visualization from an ISO 10303 Part 21 STEP file.

C++11 multiplatform utility library

Apache Superset is a Data Visualization and Data Exploration Platform

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

C-Reduce, a C and C++ program reducer

C library for OOK Manchester encoding, decoding, and dynamic clock recovery

Collection of C utils based on Redis SDSlib string library.

Lean Theorem Prover

A fancy and practical functional tools

A plugin to make the process of creating a negative captcha in Rails much less painful

3D CSG Tool

Digital Signal Processing for Go

groupcache is a caching and cache-filling library, intended as a replacement for memcached in many cases.

The Escapist

Emscripten: An LLVM-to-WebAssembly Compiler

A library for setting up Ruby objects as test data.

An arbitrary length integer library for Javascript