A couple of email signature generators I have used before
Editable for 30 days but active forever
The free version only allows 1 social icon
Hubspot email signature generator
Has branding that you can remove manually.
If you need to generate an html signature for your email then this is a great site http://htmlsig.com/
Make sure you don’t close the window or you’ll lose the data you entered.
I’d suggest creating a document to store the data the site asks for as it is useful to have on hand.
Stay away from these, they ask for details only after you’ve entered your details or the free edition is so limited as to be useless