Mostly free plans for all kinds of stuff and a few you have to buy
Save $100s by Building Your Own Router Lift!: A router lift makes working at the router table so much easier. Bit height adjustments and even bit changes can all be handled from above the surface. The thing is most commercial lifts cost way more than the router it holds, but with our plans, you can build your own router table lift for about $50. Simple hardware combined with some plywood and maple creates a robust, easy-to-use router lift.