[bullfight]

This is a release, a relatively new github feature

https://github.com/blog/1547-release-your-software

Check out the list of D3 releases https://github.com/mbostock/d3/releases/

[przemoc]

Thanks, somehow I overlooked that.

> You can also attach binary assets (such as compiled executables, minified scripts, documentation) to a release.

Nice. I knew they didn't turn Downloads off for good (API still works, or at least worked some time ago), but I didn't expect such move.