A plate joiner cuts a semicircular slot in adjoining parts. The slot accepts a flat, football-shaped plate or “biscuit,” of which there are different sizes for different material dimensions. Plate joiners can be used for all sorts of projects and are super simple to use. Check out this tutorial: How to Make a Biscuit Joint.
A BeadLock jig lets you make super-strong mortise-and-tenon joints. There are many “loose tenon” joinery systems, but at $30, this one is a really attractive option. The only other tool required is a drill, and you’ll need to purchase a supply of loose tenon stock, which comes in various sizes. It’s a bit slow, so it’s not the best choice for large production, but the BeadLock system is a perfect option for a hobbyist. To find out which joinery system best suits you, check out these 4 go-to joinery options.