While much of geometry was done with pencil and paper in the past, we are now fortunate to have the computer as an additional tool that can help us investigate its formal representation and semantics, and apply appropriate reasoning procedures. This special issue, with a selection of six papers that combine both theory and practice, demonstrates that geometry still has much to offer to our understanding of a wide array of concepts and ideas, whether through deductive or algebraic reasoning. We briefly review a few of the salient aspects of the various contributions next. In Automated Generation of Machine Verifiable and Readable Proofs: A Case Study of Tarski’s Geometry, Sana Djurdjevic, Julien Narboux and Predrag Janicic provide an interesting evolution of automated reasoning with respect to Tarski’s geometry. They demonstrate that through a judicious choice of logic for representation and of interactive and automated tools for reasoning, it is possible to produce readable proofs for a significant number of theorems fully automatically. This is noteworthy since Tarski’s axiomatics, developed as the basis for a decision procedure for elementary algebra and geometry, has often been viewed as too low-level to produce automatic proofs that humans would find conceptually interesting. In the paper Formalizing Complex Plane Geometry, Filip Maric and Danijela Petrovic describe a comprehensive mechanization of the extended complex plane and various fundamental concepts, such as Mobius transformations. The work in the proof assistant Isabelle/HOL deals with aspects that have not been mechanized previously and its