Data Entry plugin

I have developed a mysql relational database (five tables). I have added the tables to the wordpress database. Now I need a way to build a form to enter data into the tables. Three of the forms are straight forward. They are simply data on people and events. The other two tables are “join tables” populated from data in the other tables (the result of a many to many relationships).

So what I need is a plugin that lets me choose the database, and table that the form is attached to for data entry purposes.

Thanks in advance.