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.
TaskPaper - Plain text to-do lists for Mac
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.
Listy Beta - The things you love, privately saved and beautifully listed
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .