LinkBoard - LinkBoard is a quick and easy way to save and share links. LinkBoard lets you:

LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.

Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.

Getodo - colorful lightweight multi-level to-do list on Android, iOS, web.

Diigo - Diigo is a powerful research tool and a knowledge-sharing community

Keeeb - Keeeb unleashes knowledge that the corporate enterprise didn't know it had. We connect existing information islands while optimizing the discovery process with a novel workflow, and automate knowledge discovery through artificial intelligence.