If you want to host the applications yourself, Shiny Server is available for Linux. Again, there are paid and free options. Shiny Server is totally free and open source, which is a great credit to Rstudio. The paid version has a number of benefits. The main ones are the provision of support and extra features, particularly authentication (LDAP/PAM/Google accounts and running over SSL to encrypt data to and from the server). It also allows you to use multiple R processes to serve one application, supports multiple versions of R on the same server, and provides an admin dashboard that helps server administrators to monitor server load, concurrent connections, and so on.
Binaries are available for Ubuntu, Red Hat, CentOS, and SUSE ...
