CheckMySite is my latest side project and is intended to be a collection of tools to help with common day-to-day issues that crop up as you develop and maintain your application.
The first tool is an SSL Certificate Checker which checks to see if your SSL certificate is valid and when it expires.
This has arisen from a website migration job I've been working on where I am moving several sites to a new server, some with SSL configured using bought certificates, some using LetsEncrypt and some still not using SSL at all.
There are still a number of teething issues but I'm pleased to have got it out there in a relatively short space of time (working lunchtimes for the last 3-4 weeks).
Next steps - to enable monitoring and notifications of upcoming SSL certificate expirations
You can give it a whirl at https://checkmysite.io/ssl-certificates