Snipe is a cross-platform, fast-loading, programmer's editor. It's aim is to implement basic features well, rather than to provide sophistication. The current version is 0.1 which is for beta testing. It is very basic, and lacks extensive testing.
Only Linux and Windows binary zip files are currently provided. For MacOS or for a platform where the binary doesn't work, compile from source.
To install, download the zip file and unzip. You can double click on the executable, or on the help index file. Put the installation directory in your path so you can launch the editor from anywhere. In the editor, type CTRL+H to open the help documentation. The available key and mouse gestures can be gleaned from files/map.txt.