Migrating from VBA Excel 2003

I have a series of big excel files that work like a program, but I hate beeing tied up (stuck in VBA for excel 2003), so...

Whats the best way to implement a gui over a excel vba program (office 2003)? (are there any tools for that... I want to move away from the office suite, but still have it in the ba开发者_JS百科ckground)

Or what's the easiest alternative for migrating this code to a more open language. Any ideias?

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Have you looked at VSTO?

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Resolver One is a Python spreadsheet system with strong support for importing from MS Excel. It's often used for the situation you describe.