Desktop Markdown editor for Mac, Windows, and Linux that has built in backlinking, wikilinks, and Zettelkasten support.
License model is free for personal use, they intend to have paid licenses for commercial use, much like the licensing model for IDEs. Personal users pay for early access and other community features.
From the home page:
With Obsidian, your data sits in a local folder. Never leave your life’s work held hostage in the cloud again.
Plain text Markdown also gives you the unparalleled interoperability to use any kind of sync, encryption, or data processing that works with plain text files.
From the about page:
Although we call it a personal knowledge base or your Second Brain, we also like to think of it as an IDE for your notes. You can think of an IDE as a powerful frontend that tries to understand your code, such as where are functions and variables stored, what are their types, and by doing so make it super easy to navigate code and get suggestions as you type.
They used to work on Dynalist.