Tailor is currently in pre-alpha. It currently performs some of its functions (tileset import, slicing, image exporting, library and project management) but the actual combining of individual tiles into new tilesets does not yet work.
I expect to release 1.0 in a few weeks.
Installing & Running
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This depends on [rvpacker](https://github.com/akesterson/rvpacker) and [wxruby](http://wxruby.rubyforge.org/wiki/wiki.pl), and is built with rake/bundler.