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...But unfortunately, most of the traditional relational DBMS software tools support Structured Query Language (SQL) only. For a student it is very difficult to know whether a relational algebra query written on paper is correct or not. Also as an instructor it is difficult to evaluate an innovative relational query because same result can be gained by different ways.
Springbok is a free (non-commercial) educational tool to execute/validate relational algebra queries. Students, Instructors or any other interested parties can verify a relational algebra query by executing it through the Springbok.
OpenFBO is a comprehesive web based, database driven FBO management package. It provides user authenticated aircraft and instructor scheduling, tracking, and dispatch. It will also include financial services such as inventory tracking and point of sale