Microsoft OneNote

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TiddlyWiki

A free note-taking service developed by Google. With Google Keep you can quickly capture what's on your mind and get reminded at the right time or place. Google Keep is available on the web, and has mobile apps for the Android and iOS mobile operating systems. You can use your original Google Account, email or phone to access your notes stored in Google's cloud.

Orginize your notes effortlessly in the cloud with Evernote. The application is designed or note taking, organizing, task management, and archiving. With Evernote users can find information and take notes in the form of text, drawings, photographs, or saved web content that can be shared with anyone. Evernote is available cross platform and is free to sign up for, however premium features are provided at a monthly cost.

Bear is a beautiful, flexible writing application for crafting notes and prose. The app is available for iPhone, iPad, and Mac and is quick and easy to reach for when inspiration strikes. Writers, lawyers, chefs, teachers, engineers, students, parents, and more use Bear to take notes and write. Bear provides an advanced markup editor with support syntax highlighting for over 150 programming languages and support for Markdown. The editor also allow for rich previews during the time of writing so that you can see the actual prose, not code. Each note can be individually encrypted and the application itself can be locked and opened with Face or Touch ID allowing you to protect sensitive information. Bear is available for free, while also providing premium feature via a subscription-based Pro version.

MediaWiki is a free and open source wiki engine used by thousands of organizations and websites across the globe. It's the software that powers Wikipedia, which was released as a free and open source project under the name MediaWiki, a year after the release of Wikipedia. The software allows people to collect and organize knowledge in cooperation with one another, and make it available on the web. MediaWiki is now built by a community of open source developers and provides plugins can be used to extend the software further. Allowing sister sites like Wiktionary, Wikimedia Commons and Wikidata to utilize the same code base.

SlimWiki is a web-based wiki tool that can help teams documents their projects. It provides simple, versatile and powerful features out-of-the-box, that allow companies to spend more time on business related tasks and less time documenting their creations. SlimWiki is designed with a mobile-first approach and provides simple drag/drop features for placement and layout of images and files that helps you produce rich and easily consumable content.

wikidPad is a Wiki-like note taking application for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information. Links in a wiki are created by typing in WikiWords. wikidPad allows you to get a better undestanding of your research and documentation and allow you to better explore and rediscover your knowledge.