add zookeeper etcd serf consul
Add backup gem.

Provides an elegant DSL in Ruby for performing backups on UNIX-like
systems.
Added Servers for Hackers

At some point, every programmer finds themselves needing to know their way around a server.

Servers for Hackers is a newsletter for those times.
Add service discovery section and Consul.

Consul is a tool for service discovery, monitoring and configuration.
Add ZooKeeper to service discover section.

ZooKeeper is a centralized service for maintaining configuration information,
naming, providing distributed synchronization, and providing group services.
Add Doozerd to service discovery section.
deleted zeromq from Queuing

zeromq is NOT a queuing tool. its a concurrency framework, that looks and feels like sockets.
Update README.md
Moved "Dash" to correct topic
adds Bitnami to Virtualization section
Add LeoFS to Distributed Filesystems
Adding Wireshark (Troubleshooting)
Adding suggestion for CI

Suggesting Drone as a candidate for the CI category.
Add tito to packaging
Update README.md

FreeFileSync under Backups
Added Horde Groupware Suite

Pehaps Horde Groupware Webmail Edition extension to the groupware suite would be nice under the Webmail section?
added TeemIP and phpIPAM in the IT Asset Management category
Added GitBucket
Update README.md
Added SpamAssassin to Security Tools