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Hi Easy - You've found the reference software - the original HEVC implementation that was used by the people who researched and designed the standards. You probably don't want the binaries as they will run incredibly slowly and lack many practical features you need for real-world use. But this software will have good encode quality and is the reference model for decoding.
On CPU/GPU: unless the GPU has hardware specially designed for HEVC, there are limited benefits to using it to accelerate video encoding or decoding. If a GPU does have dedicated hardware then generally it will be pretty inflexible and only operate in the way that the designers anticipated. Historically quality was dubious too although it looks like this is improving. For hybrid CPU/GPU processing, data bandwidth (between separate CPU and graphics DRAM) can be an issue depending on system architecture.
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