Patreon - Patreon enables fans to give ongoing support to their favorite creators.
RightMessage - Ask the right questions, pitch the perfect offer
Podfan - A membership platform for podcasts
Linkiro - Increase your conversion rate! Add a call-to-action to links you share
Spotify Artists - Spotify's site for artists
Rite.ly - Rite.ly is a Call-to-action (CTA) header that can be used in any page.