Is there any tool available for conversion of M$ Access, Oracle etc Databases to MySQL database ?
google will probably give you more answers than this list (try also searching for the term 'datapump' and variations on it)
IBExpert is one tool that will allow you to reverse engineer an existing DB and then use the model that is created to generate SQL to create a new DB in the format of your choice (the 3 you mention are supported)
also bare in mind that not all features of each database can be translated to the others.
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