XL Deploy - Enterprise-scale Application Release Automation for any environment
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Octopus Deploy - Octopus is a friendly deployment automation tool for .NET developers.
IBM UrbanCode Release - IBM UrbanCode Release is a collaborative release management tool.
BuildMaster - BuildMaster Software is an application release automation software that also specializes in release management. It was designed by Inedo, a software development company. Read more about BuildMaster.
ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, awesome support, and a reasonable price tag.