Knowledgeshot is a service aiming to bring bite-sized articles about various subjects right to you to digest.
It is fully open-source and contributors bring updates.
Knowledgeshot Editor is a text editor made for Knowledgeshot and includes a Markdown-Editor with built-in preview and author attributions, so you can push articles fast.
It is fully open-source.
The Knowledgeshot App is available for every iOS-based platform (iOS 12.3+, iPadOS 12.3+, watchOS) and contains full Markdown preview (except on watchOS) and has every feature from the Website built-in.
It is not yet open-source as it is being worked on.