Is Approach by Lotus still a good database program ? I would like to use it on a computer not connected to the web.
No, the database is not available anymore. This was the first one to introduce this term to the market, but Lotus was bought by IBM and they've implemented the application on their product. However, here is a list with all the relational databases: https://en.wikipedia.org/wiki/List_of_relational_database_management_systems
I can tell you that SAP, Oracle, and MySQL can be used as alternatives.