A Linguistic Atlas of Early Middle English
A Linguistic Atlas of Early Middle English (LAEME) is a digital, corpus-driven, historical dialect resource for Early Middle English (1150–1325). LAEME combines a searchable Corpus of Tagged Texts (CTT), an Index of Sources, and dot maps showing the distribution of textual dialect features.
Source: Wikipedia — A Linguistic Atlas of Early Middle English (CC BY-SA 4.0)