thread - People ask bout bigger examples of Prolog. While lots of big Prolog tends to be a 'silver bullet' (read proprietary) here's some mid sized OS you can feast your eyes on - size indicated so you can find something right size
Vue integration with Prolog - medium https://github.com/jamesnvc/vuelog
Graph database - large https://github.com/terminusdb/terminusdb-server
Triple store - large https://github.com/ClioPatria/ClioPatria
JWT support for Prolog - small https://github.com/wouterbeek/prolog_jwt
Semantic web search engine - large https://github.com/LOD-Laundromat/LOD-Laundromat
Random assortment of utility libs - medium https://github.com/wouterbeek/prolog_library_collection
pluggable facade to planners - small https://github.com/TeamSPoon/planner_api
The constitution of Japan - large (Japanese) https://github.com/bitlaw-jp/the-constitution-of-japan
WordNet distributed as a Prolog version - large
https://wordnet.princeton.edu/download/current-version
https://wordnet.princeton.edu/download/current-version
refactor tool for Prolog - medium https://github.com/edisonm/refactor
Java parser - medium https://github.com/epeld/java-parse
Jupyter notebook like thing for SWI-Prolog - large https://github.com/SWI-Prolog/swish
interface to 433.92MHz transceiver - small https://github.com/skvamme/rfxtrx-prolog
IRC bot - medium https://github.com/eazar001/yesbot
Some bioinformatics solutions from a bioinformatics jam - small
https://github.com/lambdaladies/rosalind/tree/master/prolog
https://github.com/lambdaladies/rosalind/tree/master/prolog