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This document is the first iteration of an attempt to collate informationabout small-rank groups of Lie type over small fields, and their representationtheory over the defining field. This information is important in the author'swork on subgroup structure of exceptional groups of Lie type. The mostimportant information in that work is information about $\mathrm{Ext}^1$between simple modules, and so in Version 1 of this document, that data isalmost all of the data available. In addition, a lot of information about thedimensions of the simple and Weyl modules is included. More generally, one mayexpect to include details about the socle structure of the projective modules,Jordan block structure of the action of unipotent elements, decompositions ofsymmetric and exterior powers of simple modules, and tensor products ofmodules, traces of semisimple elements and so on. The ideal place for suchinformation is a dedicated website, connected to a database that could bequeried to produce the information required. This document, while imperfect,will have to suffice for now.

An Atlas of Modular Representation Theory, Version 1: Information on  $\mathrm{Ext}^1$ for simple modules for groups of Lie type in defining  characteristic over small fields