I&#x27;m a programmer in finance looking to transition to web apps. I&#x27;d like to build a few web-based tools which I would make free and open-source. I&#x27;ve come up with a list of things including stock screeners and retirement savings calculators.<p>Is there anything I can build that you&#x27;d find useful or that you would recommend as a good portfolio piece?
Ask HN: Useful web tools to build expressly to demo programming abilities?