fwiw, Spine is made using libgdx [1], which is open source. The various stretch-goal animation runtimes are also available [2] on Github.
AFAIK the team behind both libgdx and Spine are quite good at giving back to the community. After libgdx they quit their day jobs and went full-time as Esoteric Software [3] and did an excellent job following through with Spine's two kickstarters.
I think this is very relevant to HN not only because of the guys' open source contributions but also their entrepreneurial history (success?).
I think Spine was started by one of the libGDX guys, Nate Sweet, and someone else (I can't find an About or Team page on their site). The other primary libGDX developer is Mario Zechner ('badlogic around here) but I don't think he's on the Esoteric team. I think he works for RoboVM now, in fact.
AFAIK the team behind both libgdx and Spine are quite good at giving back to the community. After libgdx they quit their day jobs and went full-time as Esoteric Software [3] and did an excellent job following through with Spine's two kickstarters.
I think this is very relevant to HN not only because of the guys' open source contributions but also their entrepreneurial history (success?).
[1] https://github.com/libgdx/libgdx [2] https://github.com/EsotericSoftware/spine-runtimes [3] http://esotericsoftware.com/
(I'm not affiliated with ES but was a backer of Spine and am a user of libgdx)