aeidon is a Python package for reading, writing and manipulating text-based subtitle files. It is used by the gaupol package, which provides a subtitle editor with a GTK user interface. Separating a user interface independent general-purpose subtitle editing package from Gaupol has been an afterthought and thus not well designed to be a reusable component, but on the other hand is proven, working and maintained code. WWW: https://github.com/otsaloma/gaupol