Tomato by Shibby recommended builds for AC56U (use at your own risk):
Tomato by Shibby latest builds - http://tomato.groov.pl/download/K26ARM/
Tomato by Shibby commits and changelog - http://tomato.groov.pl/?page_id=78
Tomato by Shibby testing builds - http://tomato.groov.pl/download/K26ARM/testing/
Warning if upgrading from DD-WRT - http://www.polarcloud.com/tomatofaq#why_doesnt_my_password_work
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Tomato by Toastman commits, builds and changelog - https://www.mediafire.com/folder/x74uth2ar409t/Toastman-ARM
Tomato RAF by Victek builds (changelog + github + forum + twitter) - http://victek.is-a-geek.com/downloads.html
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=======2014 Builds=======
Tomato-ARM v119 - improved wireless driver v6.37.14.86 (r456083)
=======2015 Builds=======
Tomato-ARM v127 fixes ping issues
Tomato-ARM v132 + Tomato-ARM v132 with MultiWAN
=======2016 Builds=======
Tomato-ARM v133 MultiWAN released
Tomato-ARM v137 MultiWAN (Adblock)
Tomato-ARM v138 MultiWAN (entware-ng, exFAT)
=======2017 Builds=======
=======Useful Links=======
Tomato by Shibby site - http://tomato.groov.pl/
Package Repo - http://tomato.groov.pl/repo/
Tomato by Shibby Forum Thread - https://openlinksys.info/forum/viewthread.php?thread_id=11624
Tomato by Shibby Forum Thread - http://www.linksysinfo.org/index.php?threads/tomato-shibbys-releases.33858/
Tomato for ARM routers Forum Thread - http://www.linksysinfo.org/index.php?threads/tomato-for-arm-routers.69719/
Speedtests with and without CTF - http://www.linksysinfo.org/index.php?threads/typical-cpu-usage-for-wan-lan-throughput.70151/#post-247632
Owncloud server - http://tomato.groov.pl/?p=664 + https://www.youtube.com/watch?v=UwAXIy4lYuA
Wordpress server - http://tomato.groov.pl/?p=730 + https://www.youtube.com/watch?v=fJXwbW3QeKI
Adblock for Tomato - http://www.linksysinfo.org/index.php?threads/script-adblock-not-so-lean.72290/