Always interested in finding new ways to test blind injection and out of band responses. Here are some of the free and opensource tools i use apart from the paid burp suite collaborator:
- http://pingb.in
- https://webhook.site
- https://xsshunter.com
- https://transfer.bi.tk
- https://www.canarytokens.org
- https://github.com/JuxhinDB/OOB-Server
- https://github.com/projectdiscovery/i... (github) https://app.interactsh.com (web client)
what do you use? are there any better free/paid tools for out of band testing?