E3E's hot-swappable LED complicated Alps • E3E created a switch and LED hotswappable, backlight-capable Alps 60%, and provided an extremely detailed build log as a template for others.
Hypersphere rings • Hypersphere worked with companies that make custom parts from various polymers and foams with the goal of duplicating or even improving upon the silencing rings used in Topre RF and Type-S HHKBs. These are now known as the Hypersphere rings.
Matt3o's Topre PBT spacebars • Although the Realforce and HHKB are excellent keyboards, one feature that has always been lacking is the prone-to-shine ABS Spacebar. Thanks to Matt3o we got the first ever standard 6-unit Topre spacebar in PBT material, in different colours.
Topre for their analog switch and actuation point control • Topre showed some really interesting technology in a demo: an actuation control, which is a dial to adjust the actuation point, and pressure sensitive switches, so you can control the walk speed of a game character, emulate a piano, etc.
Zslane's SHIFT-legend fix • Finally, thanks to zslane's great work, Signature Plastic's SHIF T legends have now been fixed, and we can now all have proper SHIFT keys from Signature Plastics groupbuys.
And the Wingnut for Best input device innovation 2015, as voted for by the members of deskthority, goes to...