Toby - Better Than Bookmarks
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Weava - Workspace to highlight, organize & collaborate on your research articles.
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
Corrello - Dashboards for agile teams using Trello
Siimpl Bookmarking - Start collecting and organizing what interests you