Apps with 'Switch DNS servers' feature
The best ad blocker for Android that works for all apps and does not require root. Free and open source.
DNS Jumper is capable of modifying your DNS server address based on the types of network cards you have and the types of DNS services you select.
a DNS proxy over local VPN for filtering ads and other unwished hosts based on a host list.
A multiple browser extension (addon) to manage and switch between multiple proxies quickly & easily.