animCJK is great, but it only covers the most commonly used Kanji and Hanzi. For example, it doesn't have 鱚. If you need a database that also has hyōgai kanji, KanjiVG [1] is a better choice. (鱚 can be seen here [2]).
There's also the Kanimaji project [3] to animate files in the KanjiVG format, which could be used to get results similar to the Hanzi Writer project. If you use it to produce GIFs rather than animated SVGs, the resulting files are somewhat large though, so I wrote my own (ugly) renderer [4] to get better compression.