Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Any.DO - The #1 task management app used by over 11 million people globally, Any.do is your free mobile and online task manager for Android, iPhone, Web and more.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Microsoft To-Do - Task management tool
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .