Octopus Deploy is described as 'user-friendly release management system for professional .NET developers' and is an app. There are more than 25 alternatives to Octopus Deploy for a variety of platforms, including Windows, Online / Web-based, Linux, Mac and Self-Hosted solutions. The best alternative is Buildbot, which is both free and Open Source. Other great apps like Octopus Deploy are AppVeyor, Drone.io, PDQ Deploy and CircleCI.
Drone is a Continuous Delivery system built on container technology. Drone uses a simple YAML configuration file, a superset of docker-compose, to define and execute Pipelines inside Docker containers.
Silently deploy almost any Windows patch or application (.exe, .msi) to multiple Windows PCs simultaneously. Deployments can install, uninstall, execute scripts, reboot, copy files, sleep, send messages, etc.