Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

Best Reminder App - Why not use the browser to remind you of things?

Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

Twos - Notes, tasks, reminders, events & lists in one simple place

Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

EndNote - Accelerate Your Research. Save time, stay organized, collaborate with colleagues and get published with EndNote 20.