Dataset Search - Making it easier to discover datasets. Made by Google.
Commons Marketplace - A marketplace to find and publish open data sets.
Reader API for DataStack - Scrape and parse websites with a single endpoint
London Datastore - Datastore, dashboard and API for London's data
London Rent Hacker - Get customised living costs for every area of London
Datastarta - A database of 3150 angel investors to get seed funding