Update (9-19-2018): Looks like Screaming Frog now has scheduling in version 10.0. Leaving this tool here for anyone who may still need/want it, but go grab that update!
Hate having to wake up in the middle of the night to crawl a site when it isn’t busy? Punctual Frog is a quick and reliable downloadable/desktop app that lets you set a website and schedule a time for the crawl to run. It’s simple, easy to use, and you can download it totally free!
Read more here or access the tool below. Once you click the open button, the tool will begin downloading as a zip folder.