Kano are always impressive: http://www.kano.me/
If children's toys are your thing, MakieLab have very smart people: https://mymakie.com/
Sugru have an awesome team: https://sugru.com/about
Kokoon are doing interesting wearables stuff: https://kokoon.io/
There's also a hardware startup meet-up on next week. Usually attended by a bunch of interesting hardware companies: http://www.meetup.com/Hardware-Pioneers-by-Hardware-Startup-...
Kano are always impressive: http://www.kano.me/
If children's toys are your thing, MakieLab have very smart people: https://mymakie.com/
Sugru have an awesome team: https://sugru.com/about
Kokoon are doing interesting wearables stuff: https://kokoon.io/
There's also a hardware startup meet-up on next week. Usually attended by a bunch of interesting hardware companies: http://www.meetup.com/Hardware-Pioneers-by-Hardware-Startup-...