They have an excellent free tier for experimenting with some higher power ARM servers. As long as you're ready to give up when they decide they don't like you any more, that's a pretty cool deal. Just don't ever build anything with their hardware or software that you'd like to keep.
Edit: Java is usually pretty good, too. At least the open source stuff. Maybe stuff like GraalVM too but they had that locked down in licenses for a while and I don't trust Oracle at all.
Edit: Java is usually pretty good, too. At least the open source stuff. Maybe stuff like GraalVM too but they had that locked down in licenses for a while and I don't trust Oracle at all.