SmartMedia Pro - Smartmedia Pro Classroom Management Software allows remote-control of classrooms and virtual classroom management.
DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
NetSupport School - NetSupport School supports a teacher with a wealth of dedicated assessment, monitoring, collaboration and control features.
Commento - A fast, bloat-free comments system to foster discussion on your website
CSE Classroom Manager - Technology for Education
IntenseDebate - IntenseDebate's comment system enhances and encourages conversation on your blog or website.