What is cslistener?

There seems to be a process called "cslistener" on my machine that is listening on port 9000. A scan using nmap resulted in this, where 172.29.137.150 is the address of my PC.

Nmap scan report for 172.29.137.150
Host is up (0.000013s latency).
Not shown: 993 closed ports
PORT      STATE SERVICE
22/tcp    open  ssh
80/tcp    open  http
139/tcp   open  netbios-ssn
443/tcp   open  https
445/tcp   open  microsoft-ds
9000/tcp  open  cslistener
10000/tcp open  snet-sensor-mgmt

What's going on here? I'm on ubuntu 12.04.

nmap doesn't show you which process is actually listening to some port but which service is registered with the IANA or otherwise known to use this port.

To find out which process is actually listening on that port you can use for example

 sudo fuser -v 9000/tcp

It`s Sentry in default configuration - https://getsentry.com/