The ChemCollective is a collection of scenario-based activities, online labs, and assessments to support the teaching and learning of chemistry concepts.
Participants of the site will be able to:
- identify activities to support student learning
- modify or create activities to add to the collection
- collaborate with other chemistry educators
A Review of Stoichiometry Course is currently available free online- this course is definitely worth checking out.
Applications for Science Teachers: Chemistry teachers will find tutorials, simulations, virtual labs, and much more for helping all learners succeed in understanding concepts in chemistry.
Science for All 
I really like this lab software. Great post I hope to create a site like to help with my training.