Postman is a great tool but it might not fit everyone. Since it's a tool for developers you can be sure there are many other similar tools that do stuff a little bit different. So whatever the reason is that you want to replace Postman check the list below. Thousands of other users has provided their opinion about what they like the most.
HttpRequester is a tool for Firefox for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions. This tool is useful when doing web or REST development, or when you need to make HTTP requests that are not easily done via the browser (PUT/POST/DELETE).
A REST client for almost any web service (Firefox and Chrome extension).
Resting is a rest client. The mission of Resting is to simplify daily work of developer in testing and analyzing HTTP/Rest requests. Resting takes inspiration from Postman with the goal to be light and focused on the management of saved requests.
