Athens is a private, open-source tool for researchers solving our toughest problems. Link thoughts, reference key observations, and network your knowledge using an intuitive outliner.
POLAR - Read. Learn. Never Forget. Polar is a reading tool for networked knowledge. Use it to effortlessly annotate, highlight, and track your reading progress.
Roam Research – A note taking tool for networked thought
As easy to use as a word document or bulleted list, and as powerful for finding, collecting, and connecting related ideas as a graph database. Collaborate with others in real time, or store all your data locally.
Toodledo is a popular and powerful online productivity tool. Manage your to-do list, take notes, track habits, and organize ideas into outlines and lists.
Remember The Milk is the popular to-do list that's everywhere you are: from your phone, to the web, to your Google apps, and more. Used by millions worldwide.