They really aren't similar at all. Forge manages sub-domains, Nginx, Cron jobs, SSL certificates, queue daemons, recipes, etc. Envoyer does none of those things. Envoyer is solely focused on deploying PHP applications to multiple servers with zero downtime.
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Yes, and even more so with https://envoyer.io/ - according to the website a Laravel product.
How is this different from Laravel Forge? https://forge.laravel.com/
Taylor Otwell have replied to a similar question here before: https://laracasts.com/discuss/channels/general-discussion/en...
Forge does server provisioning and Envoyer does deployment of PHP web applications. So not quite the same at all.