Societies (Scottish)
Scottish Place-Name Society (SPNS)

Societies (Other)
English Place-Name Society (EPNS)
International Council of Onomastic Sciences (ICOS)
Society for Name Studies in Britain and Ireland (SNSBI)

Cognitive Toponymy
Digital Exposure of English Place-names (DEEP)
Fife place-name data
Key to English Place-Names
Saints in Scottish Place-Names (Database of Scottish Hagiotoponyms)
Scottish Toponymy in Transition (STIT)

Other resources
Dictionary of the Scots Language
Journal of Scottish Name Studies
National Library of Scotland map images
National Records of Scotland