WebCopy
HTTrack
SiteSucker
ScrapBook
GNU Wget
Web ScrapBook
Offline Explorer
SitePuller
ApiArk
Postman
Bruno
Insomnia REST
Tiger API Client
HTTPie
Roster HTTP Client
GNU Wget
WebCopy
ApiArkHTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Postman - The Collaboration Platform for API Development
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
Bruno - Bruno is a Git-integrated, fully offline, and open-source API client
ScrapBook - ScrapBook is a Firefox extension, which helps you to save Web pages and manage the collection.
Insomnia REST - Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a devโfriendly UI, built-in automation, and an extensible plugin ecosystem.