[NF] Experience with Firebird (nee' Interbase), recommended tools?

Anyone here have experience with Firebird, formerly the Borland Database Engine, later Interbase? (The engine's had a pretty complete rewrite since 2000, so recent experience is more helpful) I've been called on for a consult for a client using Firebird as a backend for a 3rd-party extension to Quickbooks and would appreciate:

1. Recommendations for tools to work with it, 2. Cautions for things to look out for (e.g., "Transactions are not what you think they are") 3. General comments and TGIF snarkiness.

References:

https://en.wikipedia.org/wiki/Firebird_(database_server) http://www.firebirdsql.org/ https://github.com/FirebirdSQL/firebird

Happy weekend,

Ted