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This is a modified version of the CRC algorithms by Lammert Bies. It supports more algorithms and has been ported to several languages.
It's also useful for learning how to do hexadecimal calculations and bitwise operations in various programming languages.
Disclaimer:
These test programs demonstrate the calculation of CRC.
I made these translation with a basic knowledge of each language. They may or may not be appropriately formatted / secured / robustified / idiot proofed or...
Canorus is a free cross-platform music score editor. It supports an unlimited number and length of staffs, polyphony, a MIDI playback of notes, chord markings, lyrics, import/export filters to formats like MIDI, MusicXML, ABC Music, MusiXTeX and LilyPond
VocalEasel is a simple lead sheet editor and music rehearsal tool designed for the needs of Jazz vocalists, using LilyPond to produce printable lead sheets and MMA (Musical Midi Accompaniment) to produce MIDI accompaniments.
...Oga is an XML/HTML parser written in Ruby. It provides an easy-to-use API for parsing, modifying and querying documents (using XPath expressions). Oga does not require system libraries such as libxml, making it easier and faster to install on various platforms. To achieve better performance Oga uses a small, native extension (C for MRI/Rubinius, Java for JRuby). Oga provides an API that allows you to safely parse and query documents in a multi-threaded environment, without having to worry about your applications blowing up. ...
Redland is a set of object-based, modular and portable C RDF libraries providing RDF APIs for the graph, triple storage (librdf), RDF/XML parsing and serializing (Raptor), SPARQL RDF querying (Rasqal). Language APIs in Perl, PHP, Python, Ruby and others.