KDE Connect - Integrate Android with the KDE Desktop
Brainly - Homework Help & Solver
Pushbullet - Pushbullet - Your devices working better together
EasyJoin - Share messages, links, files, folders and notifications easily and securely.
mconnect - Vala/C implementation of KDE Connect
Remind - Remind, formerly Remind101, is a communication tool that helps teachers reach students and parents where they are. It also allows for translation features to better communicate with all families.