Slackin might be a bit more popular than Moodle. We know about 1 link to it since March 2021 and only 1 link to Moodle. 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.
Moodle can handle this but it might be overkill for your requirements. Once you have it setup though the quiz feature is really great, and the analytics it provides are awesome. Source: about 1 year ago
The link was set up using app called SlackIn https://github.com/rauchg/slackin to get into public slacks painlessly. Seems like the project is abandonware & the API it's using was deprecated in 2021. Source: over 1 year ago
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