Generally I post about managed hosting as this is the easiest way to create your own online services.
However, there are many projects out there trying to make non-managed hosting easier too:
https://yunohost.org is a version of Linux that makes it as easy as possible to install your own services. Once @yunohost is installed on a server, it lets you add lots of online services (https://yunohost.org/apps) very easily through a graphical interface.
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Another approach is https://www.freedombox.org which emphasises running your own server at home.
You can install @freedomboxfndn on existing hardware including low power computers like the Raspberry Pi. Alternatively, you can buy a ready-installed FreedomBox server from the open source hardware manufacturer Olimex at https://www.olimex.com/Products/OLinuXino/Home-Server/Pioneer-FreedomBox-HSK
However you get your FreedomBox running, it lets you add lots of online services that run on the box itself (https://wiki.debian.org/FreedomBox/Features)
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@homegrown
Freedom Box is great, use it myself!
@freedomboxfndn
