Rutger Vos asked on Twitter "What would people want/expect from taxon searching on TreeBASE?". This is a good question, and one which motivated the work I did on TBMap (see doi:10.1186/1471-2105-8-158), which developed a mapping between TreeBASE taxa and other databases. In that paper I published a table showing the effectiveness of string and hierarchical queries of TreeBASE.

Mauro Cavalcanti has released e-Species, "a taxonomically intelligent biodiversity search engine" written in Python that mimics much of the functionality of iSpecies. The project is open source, with a SourceForge page, although no files seem to be available yet.