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 * [ModularGroup](https://github.com/AG-Weitze-Schmithusen/ModularGroup) ([Homepage](https://ag-weitze-schmithusen.github.io/ModularGroup/)): A collection of algorithms for computing with finite-index subgroups of (P)SL(2,Z).
 * [orders](https://github.com/feisele/orders): A GAP package for computations with orders over the p-adic integers
 * [Origami](https://github.com/AG-Weitze-Schmithusen/Origami) ([Homepage](https://ag-weitze-schmithusen.github.io/Origami/)): A package for computing the Veech group of square-tiled surfaces which are also known as origamis
+* [PAG](https://github.com/vkrcadinac/PAG) ([Homepage](https://vkrcadinac.github.io/PAG/)): A GAP package for constructing combinatorial objects with prescribed automorphism groups
 * The [PEAL](https://peal.github.io) organisation has several packages for computing with permutation groups:
     * [BacktrackKit](https://github.com/peal/BacktrackKit) ([Homepage](https://peal.github.io/BacktrackKit)): An extensible, easy to understand backtracking framework
     * [GraphBacktracking](https://github.com/peal/GraphBacktracking) ([Homepage](https://peal.github.io/GraphBacktracking)): A simple but slow implementation of graph backtracking