A number of teams have started researching or building Polkadot infrastructure and parachains.
Some of these teams are preparing for Polkadot’s launch today by building on the Substrate technology stack. Polkadot parachains don’t have to be built on Substrate, but they can be and it is easy for them to be used in Polkadot. For Substrate chains to become parachains there is very little technical overhead or extra coding. The chain simply needs to bond DOT tokens to lease a parachain slot on the Polkadot platform.
This is a rundown of the teams building out the Polkadot ecosystem. Please comment as more come online.