The Linksys 1900AC router was released to the public as a great option for people who wanted to have a top notch router with support for open source firmware. Now that some time has passed there is now alternative OpenWrt firmware (Chaos Calmer) available allowing a finer degree of customization then the factory default firmware.
After installing the latest [[https://downloads.openwrt.org/snapshots/trunk/mvebu/generic/
|firmware]] (at your own risk), you will then want to add the LUCI GUI interface.
opkg install luci (or luci-ssl for https access)