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https://github.com/ankitects/anki/blob/main/LICENSE
I'm pretty sure Anki is FOSS, though perhaps you just don't like the AGPL?
roam/sr has code at https://github.com/aidam38/roamsr
This is a plugin for Roam Research that allows you to do spaced repetition inline with your Roam graph. It keeps its state alongside your notes, and if you want to change your notes while doing a review session that's seamless.
That's exactly what I do, I watch videos, use losslesscut [1] to isolate the sentences I want to practice on, and created some custom tools to turn those into anki flashcards.
https://github.com/mifi/lossless-cut
AnkiDroid will support in-app drawing shortly[0]. There's already an e-ink mode which removes most animations, and support for image occlusions is available via third-party apps which use the AnkiDroid API [1].
Happy to discuss improvements for your workflow if it's an Android-based e-ink tablet via Discord[2]/GitHub issues.
[0] https://github.com/ankidroid/Anki-Android/issues/9363
[1] https://github.com/ankidroid/Anki-Android/wiki/Third-Party-A...
[2] https://discord.gg/qjzcRTx
Unfortunately there's no single good source for this; 30% is just an approximate aggregate figure I've come up with after seeing various people's posts on different sites.
Some things I could find just now:
Anki vs. SM-8: https://anki.tenderapp.com/discussions/effective-learning/12...
SM-2 vs. SM-17: https://supermemo.guru/wiki/Universal_metric_for_cross-compa...
Anki vs. custom machine learning scheduler: https://old.reddit.com/r/Anki/comments/d0i8uy/improved_algor...
Anki vs SM-17: https://unrelatedwaffle.medium.com/battle-of-the-spaced-repe...
SuperMemo seems to fall behind Anki in the short term (<6 months), but eventually makes up for it. Some of the links reflect that.
As for open-source implementations, there this: https://github.com/slaypni/SM-15