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I use this library whenever I need more than rand(), it's worked well for me for some simple games etc. https://github.com/effolkronium/random
There is no such thing as best random generator. They have so many different properties, e.g. is it cryptographic secure, how large is the state, how fast on x86 architecture, can it jump forward, etc. My go-to generator is sfc64 because it's fast, simple, and seems to produce high quality random numbers. Here is one implementation: https://github.com/martinus/map_benchmark/blob/master/src/app/sfc64.h other popular generators are PCG and xorshift