Three things technically set it apart from a regular chatbot: it persists — the process runs continuously, not only while you're typing to it; it actually acts — instead of describing what it would do, it browses the web, reads an attachment, or drafts a reply; and it stays reachable across several channels, each with its own dedicated address or thread.
The software itself is free and open source; running it continuously isn't (server, language model calls). Hermes Agent France installs, hosts, and maintains it for clients, with French-language support and a capped monthly subscription — the cost breakdown depends on whether you self-host it or hand it to a managed service.