One of my ongoing side-projects is my quest to self-host (along with Andrew at ScientificPineapple.com) many of the services I use on a daily basis. Andrew and I rent a server off of DigitalOcean which we use for many such services. Most of this software is partially or fully open source, and often free of charge as well. Some of the software I regularly use:
Using these services, I try to minimize how much I allow companies to mine my personal data and exploit that data for their own purposes.
In the future, I may discuss some of the administration techniques I use, as well as some of the challenges faced with these individual pieces of software.