Command Keeper - Use Command Keeper to easily organize and access your command line snippets, shell scripts, and even SQL queries. It's ideal for app developers, web developers, or just anyone who needs to spend time working with command line interfaces.
Codespace - A beautiful cross-platform code snippet manager
SnippetsLab - SnippetsLab is an easy-to-use snippets manager.
massCode - A free and open source code snippets manager for developers.
Trilium Notes - Trilium Notes is a hierarchical note taking application.
Lepton - Lepton image compression: saving 22% losslessly from images at 15MB/s