ATutor - Open Source Learning Content Management System

ATutor is an Open Source Web-based Learning Content Management System (LCMS). ATutor is used in various contexts, including online course management, continuing professional development for teachers, career development, and academic research. The software is cited as unique for its accessibility features.

Moodle - Open Source e-Learning Software     

Moodle (Modular Object-Oriented Dynamic Learning Environment) is an open source e-learning software platform, also known as a Course Management System, Learning Management System, or Virtual Learning Environment (VLE). It has become very popular among educators around the world as a tool for creating online dynamic web sites for their students. To work, it needs to be installed on a web server somewhere, either on one of your own computers or one at a web hosting company.

eFront - Open Source eLearning Software

eFront is an open source eLearning platform (also known as a Course Management System (CMS), or Learning Management Systems (LMS), or Virtual Learning Environment (VLE)).eFront is designed to assist with the creation of online learning communities while offering various opportunities for collaboration and interaction through an icon-based user interface. The platform offers tools for content creation, tests building, assignments management,

Open Source School Management System

OpenSIS is a student information system sponsored by Open Solutions for Education, Inc. Its features include Student Demographic, Goals and Progresses, Contact Information, Gradebook, Report Cards management, Health Records management, Attendance management, Parent Portal and lot more.
It provides different access level privilege to Student, Teacher, Parent and Admin. It does support Library Services and Student Billing but it is part of enterprise edition. The best open source Student Information System (SIS) that will be equal to or better than the best commercially available SIS software in the market.

Keep it open source, always.
Bring out 3 to 4 version upgrades each year.
Release updates frequently.
Get customers involved and co-create.
Build a vibrant community that will spread the love.