There's a 
new Spring version, available as windows build and source package.
License info in spring games list
FOSS-advocate Gallaecio 
clarified the license status of the "open source" Spring games and now the Spring game list features detailed license information. None of the games have 100% free for commercial usage media.
Gallaecio has (a quite empty) 
blog (in Galician [
english translation])