An easy to use GUI for remapping classes, methods, and fields of compiled java programs.
For information on how to use JRemapper and other details about it, check out the wiki.
The TLDR usage is as follows:
Control + N
Open a jar fileControl + O
Open mappings fileControl + E
Export jar file (mappings are applied to output) Control + S
Save mappings to file (Json)Control + Z
Undo mapping changeControl + Y
Redo mapping changeN
Navigate to selected itemBackspace
Go to last item See the releases page for the latest build, or compile it yourself with mvn package