Multiping - Get MultiPing Support. Network monitoring in 60 seconds. MultiPing provides a graphical view of network performance, monitors hundreds of targets, and sends automatic alerts..
Mailtrap - Email Delivery Platform that delivers just in time. Great for businesses and individuals.
SmokePing - Smokeping is a tool for measuring latency.
MailCatcher - MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a...
Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.
FakeSMTP - FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.