I have been using Entropy for years and I swear by it. Hands down the best archive app for OS X (yes, it fully supports creating RAR files). It's kinda on the expensive side, I bought it when it was on sale for under 10 bucks but I think it's worth every penny:I'm looking for a program that can RAR files and split them.
Keka does this with every format that's NOT RAR, and there's plenty of extractors, but is there a (easy to use) compressor?
AFAIK, BetterZip can read RAR files, but requires the OSX commandline version of RAR (= 29 Euro) to actually create RAR files.