Where can I find a list of all tmux options? I know of tmux list-keys -t which shows you various keybindings and their commands, but I'm looking for a comprehensive list of all possible tmux commands.
man tmux in the terminal displays the manual which has all available options.
There are also online versions of the manual (e.g. http://manpages.ubuntu.com/manpages/vivid/en/man1/tmux.1.html)
In case there is no formal documentation I found some of it in the source code. https://github.com/ThomasAdam/tmux/blob/master/mode-key.c for mode mappings