Britain for Europe- http://www.britainforeurope.eu/
UKtostayintheEU- https://www.uktostay.eu
Want2Stay- www.Britisheuvoices.com
Vote for Europe (tactical voting to stay in Europe)- http://www.voteforeurope.org.uk
Young European Movement- http://yem.org.uk
Vote Leave Watch- http://www.voteleavewatch.org.uk
InFacts- https://infacts.org
Scientists for EU- http://scientistsforeu.uk
Common Ground- http://www.commongrounduk.com/
Reasons2Remain- http://reasons2remain.eu
Facebook groups and pages
The 48%- https://www.facebook.com/groups/1214912015208730/
Fight Against Brexit- https://www.facebook.com/Fight-against-Brexit-1613939618919213
March for Europe- https://www.facebook.com/marchforeuropeuk/
Move for Europe- https://www.facebook.com/moveforeurope/
British Expats:Say Yes 2 Europe- https://www.facebook.com/groups/britishexpats.remainintheeu/
We are the 48 Percent- https://www.facebook.com/groups/1586336064998120
Youth for Europe- https://www.facebook.com/groups/Youth4Europe
Say Yes 2 Europe- Remain in the EU– https://www.facebook.com/sayyes2europe/?fref=ts
Sixteen million rising- https://www.facebook.com/groups/sixteenmillionrising/