W3Schools - W3Schools is a web developers information website, with tutorials and references on web development...
Clever - syncing between education applications for K-12 schools
Tuts Insider - Tuts Insider is a source for developers to learn web desgining, development and much more. Tuts Insider also provides 100s of examples.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Tutorialspoint - Simply Easy Learning At Your Fingertips Tutorials Point is a leading Ed-Tech company providing the best learning material on technical and non-technical subjects. Learn from free tutorials, premium courses, and eBooks all in one place.
Claroline - Claroline is a collaborative eLearning and eWorking platform.