HexEd is a BSD Licensed Text Editor example Java Program. It is also an example of the Apache Ant build system.
To git clone AND build on a Debian(or Ubuntu) machine simply run the following:
sudo apt-get install -y ant default-jdk git build-essential
git clone https://github.com/GlassGhost/HexEd
cd ./HexEd
ant
Then double click the HexEd.jar file to demo the compiled application on ANY platform with a JRE installed(windows, *nix, mac, etc.)