The INCEpTION text annotation platform can talk to terminology services using its custom lookup feature.
This repository contains a example Python-based lookup services (or proxies).
wikidata_lookup.py: looks up items from Wikidata using the Wikidata REST APIols_lookup.py: looks up medical terms using the EMBL-EBI Ontology Lookup Service
The examples provided here are meant as a starting point for your own implementations.