Copyright isn't an issue, you can't copyright a game mechanic, that's settled law. As to your question, IMO Tribes 2 is the 'best' Tribes Ascend is probably the most accessible to new people. Source link
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There are a lot of Tribes similar games that exist. They even have ones with similar weapons. You just can't use ip type stuff. If you can help development. I would point you into looking at the Broadside community on Discord. They are developing a game currently and looking for […]
best tribes game – Titanfall 1 CTF (which had tribes-like skiing). Enemy Territory: Quakewars also had skiing. so don't worry about "copyright" Source link