The controls list at the Wiki and the forums is no longer correct; this guide gives the default settings in TUG as of the end of 2016. They match the screencaps, although I've rearranged them a bit. These are, however, adaptable - you can change what keys apply to which actions, although some may not allow all possibilities.

The short version/major changes: Pick up is F; place/interact is right-click; drop is left-click. (That's right; the button that is "swing sword/shoot arrow/punch enemy" in nearly every other game in existence, is "drop what you're carrying" here, unless you change it.) T is toggle stance (stand/crouch). G is still craft; E is still inventory; J is the (new) Journal. Use = none; there is no key for "use item" unless you set one.

Unassigned letters are B I K L M N O P Q R U; I suggest setting Use to LClick and re-assigning Drop to Q.