What are some alternatives?
When comparing NetNut.io and ProxyRack, you can also consider the following products
Luminati.io - World's largest proxy service with a residential proxy network of 39M IPs worldwide and proxy management interface for zero coding.
Oxylabs - Data center proxies, residential proxy, Real-Time Crawler
AirProxy - Dedicated mobile 4G/LTE proxies
LimeProxies - Premium Private Proxy Service Provider
Proxy.co - Access the office effortlessly, using your phone
ScrapingHub - Scrapinghub is the World's Leading Web Scraping & Developer Tool