Gene Ontology (GO)
Most widely used bioinformatics ontology. Gene products described by molecular functions, biological processes, cellular components.
Visit WebsiteBrowse the tree, filter it, or click any class to see just its corner of it.
Where this one tends to earn its keep.
Functional annotation of gene products
Gene set enrichment analysis
Cross-species gene function comparison
Pathway and network analysis
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Life Sciences.