TP-LINK Archer C5 - TP Link Archer C5 is a great router for less than $100. It supports 802.11ac, has simultaneous 2.4 GHz and 5GHz bands and two USB 2.0 ports for file sharing and storage.
WiFi Map - A crowdsourced list of routers and passwords
MIWIFI by Xiaomi - Wifi router beta with a twist: you build it yourself
WifiMapper - Find free WiFi anywhere in the world
Velop - Whole-home mesh Wi-Fi by Linksys
Instabridge - Crowdsourced free wifi (now on Android)