[KronisLV]

Pomatez or any Pomodoro timer for tricking yourself into doing work, my brain needs that sometimes: https://zidoro.github.io/pomatez/

Kanboard for a blazing fast Kanban board (easy to self host, uses little in the way of resources): https://kanboard.org/

Alternatively, for more serious project management there's also OpenProject (also includes time tracking and reports): https://www.openproject.org/

Get something up and running as quickly as possible, iterate often. Containers help. Micro-frameworks or libraries are also sometimes nice (e.g. for getting a RESTful API up and running), as well as something not-too-complex like Vue for the front end. Might even go all the way to PaaS / SaaS if you want.