There are 2 repositories under shsh topic.
Restore/upgrade firmware of iOS devices
How to Upgrade any Jailbroken Device to iOS 11.1.2 with Blobs
Automatically detect changes of tss server and save shsh blobs
A beautiful & organized TSSSaver client for iOS.
A dead simple SHSH saver server that aims to be able to save your old blobs in case Apple messes up again, or plainly just save your blobs for you.