iRingg - iPhone ringtone studio + iTunes alternative (2 in 1)
Fiddler - Fiddler is a debugging program for websites.
Cardbox - Contacts reimagined as a social network ✨
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
E-Z Contact Book - E-Z Contact Book is an easy to use yet powerful Windows application for managing contact information. You can use it as a personal contact address/phone book, business directory, or a customer database, or a reminder of birthdays and other events
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.