MJML - The open source framework for responsive emails

OnlineSequencer.net - OnlineSequencer.net is an online music sequencer that allows users to create beats and music tracks.

Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.

Jummbox - A modified Beepbox that have more stuff then Beepbox. It can be used just like Beepbox. The features of Jummbox is the same of Beepbox's features, but Jummbox have more stuff to offer.

Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.

AudioSauna - AudioSauna is a full-featured audio workstation for making music online.