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Re:Ask HN: Minimal-bandwidth conferencing for remote educati... by tsegratis on Thursday July 16, 2020 @12:26PM (#23860582)
Also, have you seen digital storytelling? -- Basically powerpoint + voiceover as a way to share messages. Low bandwidth, realatively easy for teachers to create, and a good medium for communication

Also, this just came up [1], and they talk about its use in teaching, though I dont know if it gives you anything beyond the apps students already have?

[1] https://blog.zulip.com/2020/07/16/zulip-3-0-released/

Re:Ask HN: Minimal-bandwidth conferencing for remote educati... by Frauber84 on Thursday July 16, 2020 @12:36PM (#23860680)
Yes, digital storytelling is what I have been mostly doing, with ffmpeg for extreme compression, coupled with some quizzes and small tasks.

I'm familiar with Slack so I'll check out Zulip, it looks great!