The software itself is usually free to download from the developer's official channels, but it requires a paid activation and compatible hardware to function. Official Support Site:

If you are looking for functional software that manages customer data and activation without cost, consider these legitimate alternatives:

While a robust, enterprise-grade standalone tool is not available for a one-time free download, there are legitimate ways to access this technology without immediate payment.

These are "free to download" and self-host for those with technical resources. RudderStack An open-source alternative to Segment. You can download the Community Edition