Generate Anki decks. Supports cloze models and adding media.
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Mnemosyne: efficient learning with powerful digital flash-cards.
Anki for desktop computers
I'm pretty sure Anki is FOSS, though perhaps you just don't like the AGPL?
Spaced Repetition in Roam Research
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.
The swiss army knife of lossless video/audio editing
That's exactly what I do, I watch videos, use losslesscut  to isolate the sentences I want to practice on, and created some custom tools to turn those into anki flashcards.
AnkiDroid: Anki flashcards on Android. Your secret trick to achieve superhuman information retention.
AnkiDroid will support in-app drawing shortly. 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 .
Happy to discuss improvements for your workflow if it's an Android-based e-ink tablet via Discord/GitHub issues.
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Spaced repetition for memorizing tons of things.
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:
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...
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
What is the best method for studying something you haven't learned?
1 project | reddit.com/r/Anki | 20 Jan 2022
Any other addon like progress bar
1 project | reddit.com/r/Anki | 16 Jan 2022
Good Ctrl+F add-on?
1 project | reddit.com/r/Anki | 11 Jan 2022
Advice on kanji flashcards
2 projects | reddit.com/r/LearnJapanese | 28 Dec 2021
Glutanimate's Progress Bar Add-on + Review Speed + Time Left for main menu & review screen (Anki 2.1.49)!
2 projects | reddit.com/r/Anki | 24 Nov 2021