[dspillett]

In my limited experience (mostly hearing complaints from others who have to use them, rather than personal experience) there appears to be a lack of non-open-source options too!

I think the problem is that everyone wants something slightly different from an LMS. If they are lucky there is something out there that works the way they want out-of-the-box, otherwise they end up trying to bend something else into the target shape or using something that tries to please everyone so ends up overly complex and unwieldy.

> which are very restrictive in their feature set, and not customizable

What you want to customise could be key. Can you name a non-open option that you think would be at least close to ideal for your plans, without too much panel-beating to change its shape, and why that one in particular is attractive? This might help with getting better suggestions for alternatives.