Synonyms for Widget:

n.

blank, button, jigger, avatar, cell, active window, thing, box, bar, button bar, checkbox, blip, concern. byproduct, brand, line, derivative, commodity, lineup, brand leader, end product, brand name, generation. something, stuff, thingy, X, so-and-so, whatsername. gadget (noun)
appliance, apparatus, doodad, tool, device, contrivance, contraption, gizmo, thing.
instrument (noun)
contrivance, engine, equipment, utensil, gizmo, gimcrack, utility, appliance, implement, contraption, instrument, doodad, machine, tool, gadget, convenience, device, gimmick, facility, apparatus.
widget (noun)
contraption, gadget, convenience, gizmo, gismo, appliance, contrivance.

Other synonyms:

whatsername, thingy. so-and-so, jigger. something. X. stuff. thing. Other relevant words:
blank, cell, button, gismo, stuff, thingy, blip, whatsername, commodity, so-and-so, byproduct, generation, bar, derivative, lineup, something, brand, thing, line, concern, X, checkbox, avatar, jigger, box.