Connect your application with famous other services
Connect your Dolibarr with other external tools with predefined interface modules.
Use your own LDAP server so your users will share same password. Or reuse data in your LDAP to create users in application. Synchronise user data in the direction you need.
Integrate external RSS inside the dashboard.
Use the Payment modules (for example, Paypal or Paybox) to offer your customer an interface to pay their invoice online. Include payment links directly into your sent email automatically.