The Wikipedia page on the WRT lists a tremendously long list of details as regards this venerable router.
The Wikipedia page on the Tomato firmware lists the work done by Shibby, and Toastman. I see that as of this posting, Shibby had poste4 a new firmware April 22, 2014. The supported architectures have expanded to these: Asus RT-N16, Asus RT-N12, Asus WL-500W, Linksys WRT-160Nv3, Cisco Valet M10 and Netgear WNR3500L/v2. I would also point to thwe Shibby page that lists more here:
I also see that ARM based router firmwares are now in the public realm. The Netgear R7000 which is an 802.11 AC specced router is supported as of May 2. AC1900 so if that ain't fast enough, you need to be wired.
BTW the 2003 date should be changed to 2002 in the article.