A single license costs $30.
EditPlus can easily be extended with extra support for file types, a lot of users have created extentions for EditPlus you can find them in the [User Files] section.
MegaBrian has created an extention for syntax highlighting for UScript [download]
Brian Ober has also created an extentions for syntax highlighting and auto completion [download]
El Muerte [TDS] has created a syntax highlighting file for UT2003 (including all classes, constants, enumerations, structs) [download]
- See UMake for a convenient way of calling the UnrealScript compiler while editing your sources with EditPlus.
Use the following commandline for the source code editor setting in UMake: "c:\path\to\editplus.exe" -cursor %errline%:0 "%errfile%"
This will open/focus the source file at the correct line in EditPlus