John Corcoran found Showbie:

• Significantly improves attainment“The students enjoy working on Showbie. The platform is very user friendly and offers a number of functionalities.”
• Significantly builds student knowledge“Showbie enables smooth, clear communication between students and teachers. Therefore, learning results.”
• Significantly improves teaching efficiency and productivity“It is extremely easy to post and grade assignments and organize lessons. These lessons may be tweaked and improved from year to year. I actually enjoy using Showbie.”
• Significantly reduces teacher workload“Lessons may be archived and used another year. Improvements in the content and format of the lessons occur frequently for the benefit of both students and teachers.”