Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Clever - syncing between education applications for K-12 schools
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Claroline - Claroline is a collaborative eLearning and eWorking platform.