Eclipse is already portable, and it handles a large variety of programming languages. Sure, you still need Java installed on the host system, but in most cases, it works fine.
New: Audacious (June 1, 2023), Platform 25.0 (Apr 07, 2023)
New Apr 14: macOS Portable Drive Support
450+ real apps (49GB), 1.1 billion downloads, Please donate.
Eclipse is already portable, and it handles a large variety of programming languages. Sure, you still need Java installed on the host system, but in most cases, it works fine.
I have JRE on my USB key and Eclipse and it works fine...
Probably you still need some java on your host computer, but usually it is installed anyway....