I have personally used Post Affiliate Pro for almost 2. While I had some small issues, the customer support team quickly resolved them. The software is pretty affordable and has a lot of excellent features and many, many integrations. We took the advantage of free set-up and integration, which was a very nice gesture from the company.
17hats - The all-in-one business system for entrepreneurs.
Spott - API to work with cities, countries and political divisions.
Optmyzr - Optmyzr AdWords Tools. Optimization Solutions, Quality Score Tracker, Landing Page Checker, and more. Free Trial Available.
IP Location - IPLocation.io provides a free lookup tool to check the location of your Public IP Address. It finds this data through various GEO IP databases and online services. Just enter an IP and check its location easily.
LiveIntent - LiveIntent is a web platform that offers effective e-mail advertising services for marketers and publishers.
BigDataCloud IP Geolocation API - Next Generation IP GeolocationAPI