A creel assembly having an outer wall defines an interior space, a plurality of yarn package engagement locations distributed within the interior space, a gantry that is movable secured within the interior space, and at least one processor. The gantry is positioned to selectively engage yarn packages within the interior space. In use, the gantry can selectively access the plurality of yarn package engagement locations. The processor is communicatively coupled to the gantry and receives an input corresponding to a selected action by the gantry. Modular creel systems can be formed from a plurality of the disclosed creel assemblies. Methods of using and assembling the disclosed creel assemblies and modular creel systems are also disclosed.