Webface Form
Forms on a website without a server of one's own: a form declared in a plain text file renders on the page, and every submission arrives by email and as plain text rows in the website's own folder.
Webface Form is being built as part of webface and arrives as its own service here. websites on webface will use it from their own pages, and a standalone offering for any website follows.
webface turns plain text into websites: pages are written as text files, and the website builds itself. webface.io