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malidate
A logging DNS and HTTP(S) server. Opensource alternative to some parts of the Burpsuite Collaborator server.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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dnsobserver
A handy DNS service written in Go to aid in the detection of several types of blind vulnerabilities. It monitors a pentester's server for out-of-band DNS interactions and sends lookup notifications via Slack.
Yes, it’s possible to do, fairly easily if you have some sysadmin experience. However, Collaborator offers all of it on one package ready to go, so it saves time (and time is money, not just a saying). That said, you can use something like https://github.com/projectdiscovery/interactsh as an alternative.