I'm always in that mode. Just a few atm.
Digitized newspaper availability index. Something like https://sites.google.com/site/onlinenewspapersite/Home/usa but on steroids.
Probably the same for records databases, especially if Familysearch keeps licensing their data to other companies. Real time answer on who has a database for Ohio Births in 1834.
Alternative to webtrees
Historical map overlays integrated with census records, photos, then and now
A different duplicate persons checker for individuals in a gedcom
Depending on how tech-savvy you are, you might also have a look at Webtrees [1] [2]. If it's something you're comfortable with, you can run it locally in a virtual machine or run it on the web to share with others.
I've really gotten into genealogy research (and my mother-in-law has too) so I host webtrees.
Also the standards, blog, wiki (for family stories), RSS reader, file server, git repo, pi-hole ...
I use Webtrees on my own web server. That way I can control what gets added and changed, but I can also allow others to collaborate. It’s free open source software with tons of features,
The only self hosted web-based genealogy software I know of is webtrees: https://www.webtrees.net/index.php/en/#
The advantage of using software specifically designed for genealogy is that it will allow you to export data as a GEDCOM file (or possibly other genealogy file types) to import to other programs down the road.