I've been building a list of apps and libraries in this space. In no particular order:

https://requestly.io/

https://portswigger.net/burp

https://dutzi.github.io/tamper/

https://anyproxy.io/en/

https://wproxy.org/whistle/

https://www.telerik.com/fiddler

https://github.com/alibaba/lightproxy

https://httptoolkit.tech/

https://mitmproxy.org/

https://wiki.squid-cache.org/Features/SslPeekAndSplice

https://www.charlesproxy.com/

https://nssurge.com/

https://wrapapi.com/proxy

https://www.privoxy.org/

http://www.tofuproxy.stargrave.org/

https://github.com/http-party/node-http-proxy

https://github.com/joeferner/node-http-mitm-proxy

https://www.zaproxy.org/

https://proxyman.io