Recaf 
Notice: 2.0.0 is in the works on a separate branch, check it out to see the current progress. Additionally if you have any feedback or suggestions for 2.0.0 please drop a comment on the discussion thread or join the discord.
An easy to use modern Java bytecode editor based on Objectweb's ASM. No more hassling with the constant pool or stack-frames required. Check out the docs for more information.
Download
See the releases page for the latest build. Or you could compile with maven via mvn package
Screenshots
For more screenshots check the screenshots directory. They appear throughout the documentation as well.
Libraries used:
- ASM - Class editing abilities
- CFR - Decompilation
- Simple-Memory-Compiler - Recompilation of decompiled code
- ControlsFX - Custom controls (Used in pretty much everything)
- RichTextFX - Decompiler code highlighting
- JRegex - Pattern matching for decompiler code highlighting
- minimal-json - Json reading/writing for config storage
- Commonmark - Markdown parsing
- Guava - Misc utilities
- picocli - Command line argument parsing
- PlugFace - Plugin jar loading