nvALT 2 is a fork of the original Notational Velocity with some additional features and interface modifications, including MultiMarkdown functionality. Developed by Brett Terpstra
License: Open Source
KeepNote is a more feature-rich application with robust organization and formatting options, making it suitable for users needing advanced note management. In contrast, nvALT is lightweight and minimalist, ideal for users who prefer speed and simplicity in their note-taking experience.