Grant Manager for Interbase - description from Softdepia.com:
Grant Manager 3 for InterbaseŽ is a user?s permissions manager for Interbase or Firebird server. It has the following features: only Interbase 6 and Firebird are supported; templates mechanism. Using templates it?s possible to save rights set to file and use it later on; ?Copy? and ?Paste? operations for user?s permissions; one click full granting and revoking;
all database objects are supported; roles mechanism is supported. It?s possible to add and delete role; user management (add, delete and modify operation without Server Manager); reporting and scripting tools; description for database objects shown; security error check; no BDE necessary; TCP/IP, IPX and NetBEUI network protocols are supported.
Grant Manager for Interbase is a "Free to try" program. You can download and try it for an evaluation period.