Open Source Yacc Interpreters

Sieve is a mail filtering language standardized as RFC 3028 / RFC 5228 and its extensions. libSieve provides a simple, clean API for parsing and executing Sieve scripts. Code is on GitHub: http://github.com/sodabrew/libsieve

Clipper/XBase compatible compiler with initial support other xBase dialects. Multitasking, OOP,SIX/Comix, SQL and ODBC drivers,a C-API for third-party developers, a few wrappers for popular libraries (such as BZIP, GZIP, GD, Crypto, and Fcgi), ....

A re-implementation of the LISP-like 'Installer' scripting language included with AmigaOS as of version 2.1. InstallerLG aims to be fully compatible with the original as described in the V43.3 documentation. Most of the resource related limitations of the Commodore implementation are gone and the GUI has been replaced by a MUI / Zune based one.

ONSlaught is an ONScripter clone with Unicode support and other features. Its aim is to completely replace ONScripter as an open source visual novel engine by providing a completely new design and new features.

Mutabor is a Program that allows performing and composing microtonal music using a normal MIDI keybord. But it's powerful description language is intended to allow permanent retunings and tuning logics in to describ, what's actually goes on.

gpint is a General Purpose Interpreter for a Pascal-type language written in the C programming language. It runs interactively and can run scripts. It was designed to be as simple as possible, easy to understand and easily extensible.

Gimp User Filter is a plugin for The Gimp (http://www.gimp.org/), originally written by Jens Restemeier back in 1997. This project is about maintaining the plugin, keeping it compatible with current versions of Gimp, and eventually extending its features

March 2013 this project was announced first to public, but the feedback was ZERO. So I guess it is insanely bad and unusable. Ok. But sorry, I decided to continue it for myself to improve my inability and unexperience in software development FOR MYSELF. Even if it seemed to be the worst thing ever, I *NEED* to develop software for my own well being and even if I apparently - after over 20 years since the first lines of code I wrote - I improved my ability not a single bit than it is like that and I can't change it. BTW: there was feedback indeed: from the own 'family': "it is done by YOU so it cannot be of use for anybody!" (Literally: it contains algorithms and algorithms are evil and are non-existent in usable software)

An interpreter for the Right-reference Pedagogic Algorithmic Language.

A parsing toolkit that supports both top-down (LL(1) and Simple Precedence) and bottom-up parsing (LR(0), SLR(1), LR(1) and LALR(1)). The toolkit supports generating Java parsers for all the bottom-up parsing methods, based on a CUP definition.

Free ttcn3 compiler. (cpp code generator)

xacc.ide is a opensource IDE aimed at mainly .NET development. It has a code editor written in 100% C# code, which is faster than most commercial offerings.