Depending on how pedantic you want to get, my most-used self-hosted application is SSH followed closely by nginx and gophernicus.
To give an answer more in line with what the post author appears to want, I've been playing around with Pleroma lately, so it's my most-used self-hosted application until I find something newer and shinier to distract me.
To give an answer more in line with what the post author appears to want, I've been playing around with Pleroma lately, so it's my most-used self-hosted application until I find something newer and shinier to distract me.