host-sflow 1.23.4 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The actual developer of the free software is Neilmckee, Pphaal. The most popular version among host-sflow users is 1.1. Host-sflow relates to Internet & Network Tools.
From the developer:
The Host sFlow agent exports physical and virtual server performance metrics using the sFlow protocol. The agent provides scalable, multi-vendor, multi-OS performance monitoring with minimal impact on the systems being monitored. Current approaches to server performance monitoring are highly fragmented.
You may want to check out more software, such as PageScope Network Setup, Veeam FastSCP or CrossFTP Server, which might be similar to host-sflow.