Simple editor for asm51 code. Can also compile files.
You can download prebuilt releases.
AssemblerStudio: http://files.stirante.com/AssemblerStudio.zip
AssemblerStudio + JRE: http://files.stirante.com/AssemblerStudio%20-%20Portable.zip
Building requires Maven.
git clone https://github.com/stirante/AssemblerStudio.git
cd AssemblerStudio
mvn clean package
Just run AssemblerStudio.bat file