I love dokku's simplicity. Dokku allows you to get a simple server up and running in no time, do some configuration and start testing your code! Just the speed and simplicity of Dokku means everything to me.

Dokku is very easy to setup because it works as a Single Host PaaS. Once installed you can host multiple sites with all different architectures.

Deploying a web application by *pushing* its associated git repository master branch is very convenient and feels so natural. I knew Heroku users could do this and always envied them for this reason alone! Using Heroku for all my projects have been a no-go for me because of the cost. Dokku offers a similar platform for free! I can install it on a cloud platform such as DigitalOcean, which is very affordable for freelancers or small development teams. Thanks to Docker, which Dokku is based on, your app(s) lived inside isolated *containers* which give you the portability of a virtual machine, but lighter and with less overhead. Another great thing with Dokku is the plugin system. You want Postgresql database support? Just install a plugin using the Dokku built-in command: dokku plugins:install plugin-git-url. Dokku 0.5+ also allows you to run pre-deploy and post-deploy commands using an app.json manifest (as Heroku users can do). This mean, for example, that you can run database migrations automatically on deploy, which you couldn't do before 0.5. I also like the facts that Dokku uses the same buildpacks as Heroku.