The movie was created in MyPaint and composited in Blender.
Libre Graphics World writes:
Earlier this month TEMBE, a group of argentinian animators, publicly released "Viaje a la tierra del Quebracho" — the open movie they worked on most part of the last year.
Actually the premiere of the movie took place on December in Santa Fe during a film festival. However the team wasn't happy with the soundtrack's mastering and decided to postpone the online released till it's remastered. So in February the movie was finally posted online in HD. And here it is.