Amazon.com: Linksys WRT1900AC Dual-Band+ Wi-Fi Wireless Router with Gigabit & USB 3.0 Ports and eSATA, Smart Wi-Fi Enabled to Control Your Network from Anywhere : Electronics
Linksys Official Support - Linksys WRT1900AC AC1900 Dual-Band WiFi Router
DD-WRT Linux firmware comes to Linksys routers: "Open-source networking users will be happy to learn that Linksys finally made good on its promise to bring DD-WRT firmware to the Linksys router family." :
User manual Linksys WRT1900AC (English - 512 pages)
How to Set Up ExpressVPN on Linksys Routers | ExpressVPN
In-depth, hands-on review of Linksys WRT1900AC Wi-Fi router | TechHive