I self-host Shaarli[1] with the 2004licious theme[2], as an emulation of early del.icio.us. It works really well - no database (it saves a single .php file), minimal interface, and it has an Android app. It also has tag and note support. I only wish it supported plain notes; you have to have a URL for each entry.

[1] https://github.com/sebsauvage/Shaarli

[2] https://github.com/Ruin0x11/shaarli-2004licious-theme