They're both stock Emacs.

1. The part that looks like [#] is erc's mode-line indicator. It tells you the status of the IRC room you've joined.

2. The Git:master is vc-mode. It tells you the status of the current git repo. You can turn it off with (vc-mode -1).

They're both stock Emacs.

1. The part that looks like [#] is erc's mode-line indicator. It tells you the status of the IRC room you've joined.

2. The Git:master is vc-mode. It tells you the status of the current version controlled directory (in your case that's a git repo). You can turn it off with (vc-mode -1).