Which CI do you use?

In software engineering, continuous integration (CI) is the practice of merging all developer working copies to a shared mainline several times a day. There are a lot of different continious integration solutions with strong and weak sides.
Take part in the survey of our portal. Which Continuous integration system do you use?

Vexor
37% (11 votes)
CircleCI
23% (7 votes)
Jenkins
17% (5 votes)
TravicCI
10% (3 votes)
GitlabCI
7% (2 votes)
Teamcity
3% (1 vote)
Atlassian Bamboo
3% (1 vote)
Apache Maven
0% (0 votes)
CodeShip
0% (0 votes)
Semaphore
0% (0 votes)
Total votes: 30