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Sebastian Stehle
Notifo is an Open Source notification server for all channels. It handles the reliable delivery of notifications through emails, mobile push, web push, sms, messaging and APIs. A web plugin can be embedded to your website.
Notifo
Notifo
Open-source notification server for all channels
Sebastian Stehle

Mydraft.cc lets you build wireframes simply for free.

Mydraft.cc
Mydraft.cc
100% free wireframing
Sebastian Stehle

Squidex
Squidex
An Opensource Headless CMS, a CMS with an API