Elfz.io allows you to white label pages from websites like Notion along with features like forms, live chat, notion website custom domain, custom code, and more.
Cloak.ist - Connect any webpage to your custom domain, remove branding and add your own, add custom social meta tags, CSS, and Javascript.
PixelMe - URL shortener for savvy marketers
servr - Enrich your app by serving custom domains
Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
chl.li URL shortener - A simple, modern, free and privacy-friendly URL shortener.
TrelloMask - Easily mask your public Trello boards with custom domains, your own branding and Google analytics.