Raindrop.io - All your articles, photos, video & content from web & apps in one place.

Annotable - Ultimate image annotation & markup tool

Tagpacker - A free tool to quickly collect, organize, and share your favorite links.

Weava - Workspace to highlight, organize & collaborate on your research articles.

Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Airsketch - Simple screenshots + annotations for Mac 🖥️