I mean there is Paul Cantis but those have been around a long time. There definitely aren't as many canti options these days. There is the cheapie Onyx and Altus level Shimano ones and I think they still do the 105 level ones as well and then I think Velo Orange was still doing their Zeste brakes and probably some other smaller makers but I don't think there is newer better options for cantilever brakes. They are a lot less common these days especially with disc brakes and to a lesser extent linear pull brakes. I have an old set of TRP Revox brakes but they stopped making those and at the time I got mine they had stopped making the Eurox carbon versions but at that time I do recall their being a few more options but it was slowing down now I am doubtful any new comers are hitting the field. I am sure there might be some rebadged stuff or maybe a few boutique folks like say Bruce Gordon (R.I.P.) who still produce them but a lot of newer stuff better than Avid brakes is going to be tougher beyond say a Paul brake.