I saw that there is a hackable text editor Atom. I'm just curious is there a similar project for a hackable integrated development environment?
Both Netbeans and Eclipse are F/OSS software, Eclipse even has a tweaked distribution for people who want to work on the Eclipse code base.
Geany is also a F/OSS IDE. Well, either medium weight text editor with some cool configurable options or a light weight IDE.
All 3 being Open Source, they are the epitome of "hackable"