A fully Go userland with Linux bootloaders! u-root can create a one-binary root file system (initramfs) containing a busybox-like set of tools written in Go.
This is your personal local TON blockchain (ton.org) in a shape of cross-platform desktop application. It comes in a form of uber-jar with all dependencies and binaries.
Xomp is a src-to-src translator for most of 3.0. A simple platform for experimentation and optimization of OpenMP implementations and extensions. Has been tested with C programs but does not parse C. Should be easily adaptable for other languages.
The VSR is a repository of tools and challenges in verification (see for example epubs.cclrc.ac.uk/work-details?w=33971). It is part of the international grand challenge on software verification (eg http://vstte.ethz.ch/pdfs/vstte-hoare-misra.pdf)
CSP Canonical LR(1) Parser Generator. Includes lexer and parser generator. Supports all OS. Produces code as standard ANSI C++ w/ minimal STL and usable in commercial or non-commercial purposes.
SDCC-M08 is a Freeware, retargettable, optimizing ANSI - C compiler. New port for Motorola 68HC08/68HC908 processor family, a side branch of the original SDCC. It generates RAM sparing reentrant code, different from root SDCC. Distributed under GPL.
...FishNET allows you to execute a source file written in C#, VB.NET or JScript.NET without having to build/compile it. FishNET can be compared almost directly to the cscript and wscript functionality of w