doo
Todoist
Mendeley
Zotero
EndNote
BibDesk
Docear
Reminder
WeDo
Todoist
Trello
Zenkit
Remember The Milk
SSuite Sticky To Do
Taskwarrior
Asana
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
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.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
EndNote - Accelerate Your Research. Save time, stay organized, collaborate with colleagues and get published with EndNote 20.
