LINER - LINER AI Copilot is currently powered by ChatGPT/GPT-4, Google Search Engine, and information from high-quality highlights of an enormous number of users from all around the world.

Hypothes.is - Annotate with anyone, anywhere

Kjuicer - Get ready for juiced knowledge!

Snippet - Type out frequently used text snippets in a flash.

scrible - scrible lets you highlight and annotate web pages and easily save, share and collaborate on your...

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