Added SchoolTool (#699)

README.md

@@ -584,6 +584,7 @@ Some [Groupware](#groupware) solutions also feature file sharing and synchroniza
   * [Moodle](https://moodle.org/) - Moodle is a learning and courses platform with one of the largest open source communities worldwide. ([Demo](https://moodle.org/demo/), [Source Code](https://git.moodle.org/gw)) `GPL` `PHP`
   * [RELATE](https://documen.tician.de/relate/) - RELATE is a web-based courseware package, includes features such as: flexible rules, statistics, multi-course support, class calender. ([Source Code](https://github.com/inducer/relate/)) `MIT` `Python`
   * [Sakai](https://www.sakaiproject.org/) - The Sakai project provides a flexible and feature-rich environment for teaching, learning, research and other collaboration. ([Demo](https://www.sakaiproject.org/try-sakai), [Source Code](https://github.com/sakaiproject/sakai)) `ECLv2` `Java`
+  * [SchoolTool](http://schooltool.org/) - SchoolTool is free administrative software for schools. It includes demographics, gradebook, attendance, calendaring, reporting and more for primary and secondary schools. ([Source Code](http://bazaar.launchpad.net/~schooltool-owners/schooltool/2.8/files)) `GPLv2` `Python`
 
 
 ## Maps & GPS