Notational Velocity is a software for Mac OS X used for notetaking. It allows users to create notes using solely a computer keyboard and search them using incremental find. Developed by Zachary Schneirov
License: Open Source
Piggydb offers a more flexible and customizable way to organize notes with a focus on linking and tagging, while Notational Velocity emphasizes speed and simplicity in note-taking with a minimalistic approach.