I'm developing a set of tools meant to aid in learning Chinese characters and I realized that I don't know a good dataset containing character decomposition. Ideally it should be comprehensive (or have as good coverage as possible), machine-readable and available for free (creative commons?). So far I know about Wiktionary and Make Me a Hanzi. What are the other ones?
CHISE (http://www.kanji.zinbun.kyoto-u.ac.jp/projects/chise/ids/index.html) is one of the most comprehensive ones available, containing decompositons for almost all characters in the CJK unicode block.
https://github.com/amake/cjk-decomp or https://github.com/cjkvi/cjkvi-ids is what you're looking for. Licenses are included in the repos. The IDS decomposition is newer but licensing seems a bit unclear. Then again, Chinese characters haven't changed since the first repo, cjk-decomp, was created, use that perhaps.