Here are some interesting ones:
Wood: https://grovemade.com/standing-desk-system/ https://store.hermanmiller.com/standing-desks/new-canaan-lea...
4 leg style: https://shop.humanscale.com/collections/sit-stand-desks/prod... https://www.branchfurniture.com/products/four-leg-standing-d... https://store.haworth.com/products/elements-4-leg-height-adj... https://store.hermanmiller.com/standing-desks/spout-sit-to-s... https://gobeflo.com/products/tenon-smart-adjustable-desk https://www.roomandboard.com/catalog/office/desks/parsons-el...
pedestal style: https://milk.dk (not sure if discontinued but I've always wanted one, you can see it in action here https://www.youtube.com/watch?v=7td7143AewU)
not adjustable but ultrawide desk/dining table: https://www.lumens.com/base-table-by-muuto-MUU2248533.html?A... https://hivemodern.com/pages/product10290/palladio-rectangul...