[codekilla]

The Quantenkoffer by qutools is an interesting kit for learning about quantum stuff [1]

Also, Qiskit pulse was fun to play around with (haven't in awhile, don't know what the current capabilities are) [2]

[1] https://qutools.com/quantenkoffer_science-kit/

[2] https://qiskit.org/documentation/apidoc/pulse.html