Thanks ahead of time, I'm putting this here ( you might have a better sub for me - please do let me know. )

I'm teaching organic chemistry (first semester college level) in the Fall and looking for an Open Source Homework tool. In the past, I really didn't see any that were great - and it has been a while. So perhaps the group has some new places for me to look at.

I'd rather not use a pay system - students pay enough. I also don't want something that is not ready for prime time or too watered down that makes it wrong for my intended audience.

If you have any recommendations, love to hear them and reasons why they are great. Khan has a great offering, just wondering though if using them for "homeworks" would be the best or if better options are out there.