Festool Biscuit Joiner. Sides adjust independently for centered or off-center mortising. I have been getting questions lately from people wondering what the differences between a biscuit joiner and a domino were.
The jointing system is suitable both for panel, frame, and rack joints..
If the Festool DOMINO is appealing because of the hidden joinery it does so well, then there is a more economical option: a biscuit joiner.
Another well-mentioned alternative to the Festool Domino Joiner is the biscuit joiner. This is a high-end tool and as such is built to last. After building countless face frames, dozens of pieces of furniture and even counters with a biscuit joiner it provides a portable and high quality joint.