Wunderlist is a cloud-based to-do list management app.

Todoist: To-Do list and Task Manager.

TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.

Any.do is a life management and productivity app.

Gmelius is a free browser extension available for Google Chrome, Mozilla Firefox and Opera that customizes the look and feel.

Google Keep is a cloud based note taking application.

Inbox by Gmail is a new app from the Gmail team. Inbox is an organized place to get things done and get back to what matters. Bundles keep emails organized.

TagSpaces is an open source data manager and file navigator. It helps organize files on local drives by adding tags to files.

Teamwork Projects is a project management app.

GNotes is a simple and clear note app. It is available for you to take notes, keep a diary, write down ideas, create checklists, etc.