So I've been doing some work on the IBM PC 5150's little-used cassette interface lately, and I've made a couple of projects that might be useful on the off chance that someone out there besides me cares about it. =)

https://github.com/lampmerchant/cass5150 - cass5150, a Python library for parsing and working with 5150 cassettes and their rudimentary "filesystem", useful if you want to make a cassette.

https://github.com/lampmerchant/cassbox - CassBox, a utility for running IBM Cassette BASIC with an emulated cassette interface on DOSBox.

Let me know if you find these interesting or useful!