Issuetrak - Issue tracking software for help desk and customer service
Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
Deskun - Deskun is a Help Desk system inside Gmail. It enables you to support customers directly from your mailbox, manage projects, and use free features for Gmail.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Kapdesk - Kapdesk offers support teams with a helpdesk software to streamline support tasks.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.