In my local community, several volunteer organizations have "work days". Where you can just show up and be assigned tasks. Mowing grass for the elderly, or serving food, or packing emergency supplies, or weeding the flower beds at a community center. You could always do this kind of thing even though it is not technical.
It's also a great way to network with people and discover opportunities to help in more technical ways. Many of these volunteer organizations operate on a shoestring budget, so they could certainly use it. Even very large organizations, you might be surprised by how lean your local chapter operates. Fixing computers especially, but it could also be networking or setting up a local server. Developing apps are a much larger commitment generally, so it is harder to get that going.
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