
Description: SPFToolbox is an email delivery and inbox testing tool for email marketers. It allows you to validate and monitor email infrastructure to optimize deliverability. Features include inbox testing, blacklist monitoring, and email rendering.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Dnsstuff is a free online DNS and network tools provider that offers various utilities for network troubleshooting, analysis and monitoring. Some key tools include DNS report, DNS health check, SMTP test, trace route, whois lookup and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API