CondLean 3.0: Improving CondLean for stronger conditional logics. In this paper we present CondLean 3.0, a theorem prover for propositional conditional logics CK, CK+ID, CK+MP, CK+CS, CK+CEM and some of their combinations. CondLean 3.0 implements sequent calculi for these logics. CondLean 3.0 improves CondLean and is developed following the methodology of leanTAP. It is implemented in SICStus Prolog and also comprises a graphical user interface implemented in JAVA. CondLean 3.0 can be downloaded at url{http://www.di.unito.it/ pozzato/condlean3/}