BridgeBase Online: https://www.bridgebase.com/
When: Tuesday and Thursday at 1.30 pm on BridgeBase online - visible on BBO/Virtual Clubs/EBU - England with host vEBU_NFK approx 2 hours before the tournaments starts. These events are EBU affiliated and cost $3 - although SIMS and Children in Need cost more - they count towards EBU Masterpoints and NGS.
And: Wednesday at 7.00pm and Sunday at 1.30 pm again on BBO but these are under Competitive/Free Tournaments with host Maxcollie2. These are free events just fun.
How: Make sure you have given your name, email and BBO username to Karen Blacklock (email@example.com) at least 1 hour before the tournament starts.
Register with your partner at least 10 mins before start of the tournament
If no partner register on tournament partnership desk where others can see and invite you to play with them
Results: Available 20 mins after the end of the tournament on BBO.
FUNBRIDGE - https://www.funbridge.com/
Funbridge is a pay to play system which you only play against robots. The robots play a form of 2/1 which you need to learn to play against them effectively.Clubs joining Funbridge can run tournaments for their membership but all players play the same cards against robots and their scores are compared against each other.
BridgeClub Live - https://www.bridgeclublive.com/BCL_Login_Y.asp
This is a UK based duplicate bridge system available to bridge players worldwide for a subscription of around £7 per month.
You only play against real people on BCL - no robots
Many of the members on BCL have been on the system for many years - there is a real sense of community and people are generally more civil than on BBO.
BCL players more often play ACOL based bridge
There is an excellent review facility where you can see all bids and play.
There is a 24 hour daily competition called DIDO which you can earn EBU online masterpoints if you play well and have played at least 16 boards.
Your Club can register its members so that you can see results from the daily competition for all members in your club that are on the system.
There are other competitions and leagues organised throughout the year and there is an annual face to face event alternating between UK and somewhere abroad each year.