Hmm. This is interesting.
A while back, Sony released their tool-building software, the Authoring Tools Framework, as open-source software.
Today they've released their level-building software, LevelEditor, which they say can be integrated into the major game creation engines.
I don't know whether the output is PlayStation-specific. If not (and it sounds like not, as long as your game engine isn't), then this could be a pretty useful tool for new level builders to learn the craft for zero monies.
Both ATF and LevelEditor are available on Sony's GitHub page.
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