Suomen DX-Liitto ry (SDXL)
Recreation, Radio, Shortwave and DX Listening, DX and Radio Groups - Finnish DX Association. FDXA is the radio club in Finland and have mostly information in Finnish.
http://www.sdxl.org/
British DX Club (BDXC-UK)
Recreation, Radio, Shortwave and DX Listening, DX and Radio Groups - British DX Club (BDXC-UK). For DX-ers interested in broadcast band DXing on shortwave, mediumwave and VHF/FM bands.
http://www.bdxc.org.uk
Worldwide Utility News
Recreation, Radio, Shortwave and DX Listening, DX and Radio Groups - Worldwide Utility News. A web based club for sharing news and information about utility (non-broadcast) transmissions through the WUN listserver e-mail list.
https://www.wunclub.com/
Hard-Core-DX.com - Probably the best DX site in the world
Recreation, Radio, Shortwave and DX Listening, DX and Radio Groups - Hard-Core-DX.com. Comprehensive collection of DX listening resources from veteran DXer Risto Kotalampi includes breaking news and DX tips, Latin and Andean DX reports, Medium Wave DX, solar reports and antenna topics.
http://www.hard-core-dx.com/