From FAQ:
Can I sell my apps or components with the Starter edition?
Yes. You may sell any apps or components developed with the Starter edition under the Starter license until your annual license or service revenue exceeds US $1,000 or local currency equivalent. If your annual license or service revenue generated from the output of the Starter edition exceeds US $1,000 or local currency equivalent, then a Professional edition or higher license is required to be purchased. Special pricing for Starter upgrades to Professional, Enterprise and Architect editions is available specifically for this purpose.
Can I deploy apps built with the Starter edition for internal use in my company?
A Professional, Enterprise or Architect edition license is required for developing or deploying any apps or components within any company with total company revenues exceeding US $1,000 or local currency equivalent.
Can I add additional commercial and open source tools and VCL components to Delphi XE Starter or C++Builder XE Starter?
In general, yes. However, the Starter editions don't include some features that are available in the higher editions like dbExpress. Since dbExpress functionality isn't included in the product, you wouldn't be able to add something like third party dbExpress drivers. Delphi XE Starter and C++Builder XE Starter don't have restrictions on adding components like the old Turbo Explorer products did. See the Delphi Feature Matrix or C++Builder Feature Matrix for more information.