1) Here you can find Community Modules or share your own modules: https://github.com/freescout-helpdesk/freescout/wiki/Community-Modules

2) We can integrate FreeScout with Twitter by converting incoming messages into FreeScout conversations and allow to respond to them from the FreeScout. If you have a Twitter Developer Account and can provide a temporary access, so that we can develop the Twitter Integration Module Рplease let us know: https://github.com/freescout-helpdesk/freescout/issues/1077