DD-WRT recommended builds for WRT160NL (use at your own risk):
DD-WRT latest builds by BrainSlayer - ftp://ftp.dd-wrt.com/betas/ + http ftp + http ftp2
DD-WRT timeline - http://svn.dd-wrt.com/timeline
DD-WRT bug tracker - http://www.dd-wrt.com/dd-wrtv2/bugtracker/
DD-WRT changelog - http://www.dd-wrt.com/phpBB2/viewtopic.php?t=279467
DD-WRT wireless driver changelog - http://svn.dd-wrt.com/browser/src/router/driver_changelogs/driver_repository.log
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DD-WRT by Kong builds and changelog - http://www.desipro.de/ddwrt/K3-AC-Arm/ (old) (mirror) (forum)
Kong ceasing DD-WRT development prank - http://www.dd-wrt.com/phpBB2/viewtopic.php?t=269359
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ASUS routers with DD-WRT firmware - http://www.asus.com/us/site/routers/DD-WRT/
RMerlin's profile - http://www.dd-wrt.com/phpBB2/profile_sec.php?mode=viewprofile&u=203365
=======2013 Builds=======
=======2014 Builds=======
-r23919,-r24118,-r24160,-r24461
-r25139-testing use r25179 instead
-r25143-testing use r25179 instead
-r25203 use r25279 instead due to some mounting issues
-r25251 use r25279 instead due to some mounting issues
-r25273 mounting issues fixed, use r25279 instead
-r25279,-r25309,-r25408,-r25527,-r25544,-r25628,-r25648,-r25697
=======2015 Builds=======
-r26081 (WAN not working, don't flash)
-r26125,-r26138,-r26332,-r26339,-r26348
-r26372 last build with working IPv6 PD
-r26405 IPv6 issues with radvd, WAN receives IPv6, but does not delegate prefix to LAN clients
-r26446 IPv6 radvd still broken
-r26635, r26653, r26839, r26854, r26866, r26947, r27086
-r27096 added dark theme
-r27332 dd-wrt upgraded from v24-sp2 to v3.0
-r27343, r27360, r27378, r27396, r27413, r27435, r27453, r27456, r27490, r27506, r27600, r27700, r27716, r27734, r27745,
=======2016 Builds=======
changelog - http://www.dd-wrt.com/phpBB2/viewtopic.php?t=279467
=======2017 Builds=======
=======Kong Experimental Builds=======
-r23884,-r23900,-r24045,-r24500,
-r24680 - experimental build with Hardware NAT acceleration with WAN->LAN 800 Mbps throughput
-r24710 - this build replaces r24680
-r24800,-r24865,-r25000,-r25015,-r25090,-r25100
=======Upcoming Fixes, Changes. Updates and New Features=======
libimobiledevice changelog on dd-wrt - http://svn.dd-wrt.com/browser/src/router/ipeth/libimobiledevice/NEWS
libimobiledevice changelog on GitHub - https://github.com/libimobiledevice/libimobiledevice/blob/master/NEWS
'Trust This Computer' alert in iOS - https://support.apple.com/HT202778
=======Useful Links=======
RT-AC56U guide - https://wiki.dd-wrt.com/wiki/index.php/Asus_RT-AC56U (AC68U)
Asus supported devices wiki - http://www.dd-wrt.com/wiki/index.php/Supported_Devices#Asus
AC56U dd-wrt thread - http://www.dd-wrt.com/phpBB2/viewtopic.php?t=173910
AC66U dd-wrt thread - http://www.dd-wrt.com/phpBB2/viewtopic.php?t=159637
AC68U dd-wrt thread - http://www.dd-wrt.com/phpBB2/viewtopic.php?t=177612
How to enable IPv6 PD - http://community.linksys.com/t5/Wireless-Routers/About-download-speed-cut-on-Linksys-E900/m-p/753645/highlight/true#M267225
DD-WRT Firmware by BrainSlayer Forum Thread - http://www.linksysinfo.org/index.php?forums/dd-wrt-firmware.31/