Every few months I gather things that can be used by teachers and students and donate them to a local foundation that collects (in particular) discarded arts and crafts things. They also have stuff for school theater arts, so building sets, costume design, and more. But they can also put good use to office supplies, organizers, chairs, files, etc. so the mix is quite varied. Strategic use of decluttered stuff. The object is to have a warehouse full of the materials that school teachers can shop for free. They also have a small gift shop to sell some things for revenue.
Last summer I took in an antique cast iron sewing machine that had been serviced and didn't sell on eBay (the foundation teaches sewing every week, and most of sewing is straight seams forward and reverse. This machine does that). My next appointment will be to take over a bunch of surplus durable electronics cases like laptop and camera bags, along with small shelving. If I don't find new homes for all of the 2026 calendars that charities have sent as inducement to subscribe I'll send them over.