
HTTP Debugger
Surge for Mac
Charles Proxy
Weer
James
HTTP Headers
HTTP Toolkit
mitmproxy
UMLGraph
draw.io
Dia
LucidChart
yEd
OmniGraffle
UMLet
CollabNet
HTTP Debugger is a professional HTTP sniffer and analyzer for developers.
You can use HTTP Debugger to debug HTTP API calls to a back-end and between back-ends.
HTTP Debugger is very easy of use, with clean UI, and short ramp-up time.
It's not a proxy, and does not produce network issues!
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Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
draw.io - Online diagramming application
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.