This page is a growing list of guides on how to do permacomputing-related things, which may or may not be relevant depending on your context.
There is a quote about solarpunks that there are two main kinds of solarpunks: "Junkers", who scrap things together from trash, and "Reformists" who try to make new systems that work well in the first place. This is a bit of a reduction, but a similar framework could also apply to permacomputing — making mainstream tools work more efficiently, building things out of trash, or designing entirely new systems could all be moving in the direction of permacomputing.
Everyday Permacomputing
making popular computing tools work more efficiently and last longer
How To Make Firefox More Efficient On An Old Computer Using AutoTabDiscard — a guide on how to use firefox browser extensions to make using an older laptop more enjoyable
How and Why I Stopped Buying New Laptops by Kris De Decker — a guide on using older thinkpads
New Systems Energy
building new systems with better foundations
Building Autonomous, Off-Grid, Encrypted, and Solar Powered Communications Infrastructure by @hydroponictrash — a guide on building autonomous communication networks with LoRa