Time 2 - Stay focused and crush procrastination

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

Time Tracking for Freelancers - A simple, fully integrated time tracker for freelancers

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

Timing - Timing is the best way to keep track of the time you spend with your Mac.

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