I envision gnomes as tinkering with mainly mechanical stuff, like very intricate clockwork, but occasionally "cheating" with magic -- nothing fancy, visually at least; maybe something that breaks the laws of physics in a non-ostentatious way (like conservation of energy or something like that). So you could have a watch that never needs to be rewound; a pen that never runs dry (although that's stretching it a bit for what I figure gnomes would do); maybe all kinds of fun clocks. You could look to cuckoo clocks for inspiration there: there are some really fun cuckoo clocks (in the real world that is
) with very intricate mechanical choreographies, little people coming out and dancing etc; I would picture gnomes having lots of "useless" but nifty stuff like that lying around.
As for things that are actually useful to adventurers, maybe things like navigation devices; compasses that work in unusual places (underground in a mine, where metals would normally disrupt the magnetics) or that do unusual things (like pointing to a designated, settable spot instead of north); a kit of small tools (screwdrivers and the like) that keeps itself organized and replaces broken tools; and so forth. Glasses that magnify while changing colors; glasses that have several swappable lenses; glasses that let you see in funny angles (like glasses with lenses that let you see behind you); etc.
Basically I picture gnomes as having all kinds of nifty things that aren't necessarily useful, but "fun" and capricious; and stuff that might be what we'd consider socially unusual (like hats with fans on them to cool you off) but serves a function. The glasses come to mind again; it'd look kind of silly to have glasses with two sets of fully rotating lenses!
Hope this helps... as for names, I have no idea.