Fiddler
Charles Proxy
Postman
Horangi
Proxyman.io
PracticeProtect
Intruder
Rapid7 MetaSploit
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
Fiddler
kdiff3Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Beyond Compare - Beyond Compare allows you to compare files and folders.
Postman - The Collaboration Platform for API Development
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Horangi - Horangi is a leading cyber-security solution that provides instant response and threat detection for companies who lack the time and expertise to monitor their system.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.