Open Source Software for Music Publishers
When it comes to open-source solutions for music publishers, there are very few practical ones. Let’s have a look at what is currently out there.
WESO - Web Semantics Oviedo has published several open-source repositories related to CWR. I tested the parser a while back and it worked well. However, creating CWR was not covered at the time, and as far as I can tell, it is still not.
WESO has shown little activity in the past few years. Besides the core CWR project, they started several other related projects which seem abandoned. Still, an open-source can easily be forked and revived. Bu, when it comes to music publishers who want to create CWR files, it has very little value.
An excellent basic PHP library for reading, writing and manipulating CWR files. It has been used in production for years by the creator. It converts CWR-compliant data into CWR, but if data is not CWR compliant, resulting CWR may not be valid either, as the validation is incomplete.
APORIA is actively developed and may be a great add-on for in-house projects, particularly those written in PHP. However, there are no plans for it to become anything more than just the generation/parsing library.
Django Music Publisher
Django Music Publisher is open-source software for original music publishers. It is a tool for managing metadata for musical works and recordings, including data about writers, recording and performing artists, albums and music libraries, as well as royalty distribution processing. By me.
Music Metadata - Python libraries
This is a series of libraries for music metadata management, released as open-source. Still in the early stage, they are to replace most of the tools on this web site. Also by me.