Yes, but they require you to fill out a long, detailed form about what project you're affiliated with, exactly what resources you need and for how long, an IBM advocate (?), and so on.

This is quite inconvenient for someone just wanting to do a little bit of experimentation before committing.

For instance, I was interested in experimenting with AltiVec on POWER for the Rust bug bounty. I wanted to get an idea of the scope of the problem, see how things work in C and C++, do a little bit of quick microbenchmarking in C and C++ to see how it compares to SSE.

If it turns out that it was something I was interested in pursuing further, I might try to work with the Rust project to apply for this kind of access officially for a CI system for the Power architecture. But that's a lot of trouble to go through if I just want to do some quick experimentation before deciding on whether the scope of the project is worth it.