Katana 1.1.1 for Mac is available as a free download on our application library. This Mac application was originally developed by witiz. The program belongs to Productivity Tools.
From the developer:
Katana is a powerful and minimalist note taking app. Your notes are stored in plain text but you can easily format them as you type with the built-in markdown syntax highlighter. You focus on content, the app formats it automatically. The built-in search engine lets you search notes by subject, content and also by tags. It also highlights matches as you type.
You may want to check out more software for Mac, such as Katana Wars, Metal Gear Rising - Revengeance or Undead Walking Experiment, which might be similar to Katana.