Tiny Tim (Krist & Hook 2011) is a point spread function modeling tool developed for HST. Details of the code's operation, configurable parameters, and products are given in the Tiny Tim User's Guide (Krist & Hook 2004, version 6.3). Tiny Tim is no longer maintained or supported by STScI; a final version of the source code is hosted "as-is" on Github, for legacy purposes.