Wireframe.cc - Sweet and simple online wireframing tool.
Novu - The ultimate library for managing multi-channel transactional notifications with a single API.
WireframeSketcher - WireframeSketcher is a wireframing tool for creating wireframes, mockups and prototypes for desktop, web and mobile apps. It's a desktop app for Mac, Windows and Linux, and a plug-in for any Eclipse IDE.
SuperSend.io - Automate Cold Outreach Across Email, Linkedin and Twitter.
Saola Animate - Easily create engaging HTML5 animations and interactive web content without coding skills
SuprSend - Single Notification API for Every Channel (SMS, Slack, Whatsapp, Email, SMS, Push, App Inbox)