Followup.cc might be a bit more popular than BookWidgets. We know about 1 link to it since March 2021 and only 1 link to BookWidgets. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Check outBook widgets too, similar to H5P but integrates with Google Classroom and has teacher discounted plans. The examples are more K-12, didn’t see what grade level you are teaching. Source: almost 2 years ago
I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. Source: over 1 year ago
Padlet - Visual boards for organizing anything.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Quizalize - Quizalize is a leading web-based and mobile-based classroom application that delivers the best and easiest way to differentiates your teaching.
FollowUpThen - The simplest way to schedule an email reminder
Socrative - Socrative helps teachers engage the class with educational activities to measure and visualize...
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.