Installation instruction and other documentation can be found on readthedocs.
WARNING: Indium 2.0 now uses a client/server architecture, see installation instuctions.
The stepping debugger
The REPL with company-mode
The REPL showing clickable output
Indium is young, here's a list of missing/wanted features
C-x C-efrom project JS buffers
There is currently support for Chrom[e|ium] & nodejs. The firefox backend is in the TODO list.