There are 2 repositories under ligand-receptor topic.
MultiNicheNet: a flexible framework for differential cell-cell communication analysis from multi-sample multi-condition single-cell transcriptomics data
A manually curated database of literature-supported ligand-receptor interactions in human and mouse
Cell-Cell Interaction Discovery in Single Cell RNA Sequencing
LIANA x Tensor-cell2cell Protocols
A quick and dirty virtual screening task for potential ligands of Flavobacterium johnsoniae Tyrosine Ammonia Lyase (FjTAL)