Useful Links

Here are links I have found that are very useful.

Callsign Databases.

Great Software.
Log4OM good free logging software
Minos contest logger
N1MM+ contest logger

Good map utilities.
(Ones now as strikethough text ruined by Google)
K7FRY locators on Google maps
Maidenhead locators on Google maps
TK5EP locator mapping page
Address to Maidenhead search map
Maidenhead from OS Grid ref
Find your NGR on Google maps
Find NGR/Lat long for UK
Find NGR/Lat long for Ireland
Find NGR/Lat long/Altitude world
Hug-Good online OS mapping
UK postcode map
Online postcode map
Summit line of sight plotter
Summit view plotter
Find altitude on Google maps
Radius around a point on Google maps
Simple QSO map plotting page
Detailed EDI log analysis page
Very good log mapping
Nice manual entry QSO mapping
WG7J grid mapping (drag if not in USA)
SM7LCB QSO map (best with EDI file)
SM7LCB QRA map (best with EDI file)
Opencontest EDI visualiser
K2DSL ADIF mapping page

Antenna interest.
DK7ZB Yagis & Match
Feed line facts
GM3SEK dipole chokes
Good read on common mode chokes
50 or 75 ohm coax
Coax loss calculator
Few tips on traps
Attic multi band coax trap antenna
Portable link dipole
Link dipole calculator
YU7EF Yagis
G3TXQ Cobweb 5 band antenna
GM3SEK yagi links
Good page on element mounting
Power splitters
More power splitter info

Boards and Forums.
Log4OM forums
SOTA (Summits On The Air) forums
WAB (Worked All Britain) forums
Ham Radio Deals

General Interest.
GM3SEK useful info

Supplier sites.
Nevada Radio
Martin Lynch & Sons
SOTAbeams antennas & parts
The DX shop

Clusters and Propagation.
Solar and band conditions
Filtered SOTAwatch
DX Summits spotting cluster
DX Maps
ON4KST chat rooms
Hepburn tropo forecast map
F5LEN tropo forecast map

Radio Organisations.
RSGB VHF Contests
Worked All Britain
Summits On The Air

Android Apps.
Rucksack Radio Tool