Rigove
I put my flat in the UK on the market recently and it has given me a lot of insights into how broken the real estate market is! One thing I found particularly annoying is how dominant rightmove is and how much of the traffic for house hunting they control. As a small way of standing up to them I created https://rigove.co.uk/ (rightmove without htm - the hidden toll machine ;) If you change rightmove to rigove while browsing a property for sale you get a page which shows where else that property is listed. It is only a few days old so it is currently more miss than hit but I plan to reach out to estate agents to increase coverage as quick as I can.