Rustam can weigh in here, but I'm not exactly sure what with Argo we'd open source. Argo is a collection of a bunch of different technologies that we use to measure the performance across our transit, peering, and backbone connections. We then send different requests down different paths depending on each customer's particular needs and settings. While I'd imagine we will open source parts of the overall system, there's not really a stand-alone package that we could make available for anyone else to use.
If there's a particular part of the overall Argo that would be helpful for you or others, let us know and we'll certainly consider it. Here's a list of things we've built at Cloudflare and open sourced already: https://cloudflare.github.io/
