We know shadowrun is memorable for all the fiddly little bits and bobs you can outfit your character with. What I'm asking for here is a bit of gear you made good use of that others may not have thought of, was super important and saved the run, or you just really enjoyed using.
I'll start with two of my favorites:
The Area Jammer is great for enabling stealthy takedowns of guards. Flip on the scanner, do your cool non-lethal takedown, the decker loops his biomonitor signal, stuff him in a closet and off you go. A momentary burst of static is much less suspicious than a suddenly offline biomonitor.
VidMate MobdroThe Paint Grenade has loads of uses, depending on what substance you load it up with. Need an instant oil slick, make a room mostly inaccessible, or slow pursuit? Lube Grenade. Need an area locked down, doors fastened shut? Glue Grenade. Need to reveal invisible people, or blind cameras? Regular old paint grenade. Want an instant riot/crime against humanity? K10-DMSO Grenade (GM discretion advised).