https://furka.github.io/40k-10th-list-builder/
It supports all factions (including forge world) and lets you adjust which models are in your personal collection.
(source code: https://github.com/furka/40k-10th-list-builder)
It only does the list (which you can print, ctrl+P) I didn't personally find it useful to include the datasheets since those are freely available as a PDF. (also there might be copyright involved)