CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Approved - The better way to get approvals, right inside of Slack
Semaphore - Semaphore is a fully managed, high performance testing and deployment solution for your company. A Continuous Integration tool.
ApproveIt for Slack - Get approvals in minutes, not days. Right from Slack!
Heroku CI - Continuous Integration from Heroku
Approve app for Zendesk - Any enforceable and auditable approval workflow for Zendesk tickets you can imagine can be easily created using the Approve app.