HTTP Debugger
Surge for Mac
Charles Proxy
Weer
James
HTTP Headers
HTTP Toolkit
mitmproxy
yEd
draw.io
LucidChart
OmniGraffle
PlantUML
Dia
UMLGraph
Gliffy
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!
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
draw.io - Online diagramming application
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
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.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.