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odcrawler-scanner
A reddit bot that scans ODs over at /r/OpenDirectories and submits the results to the ODCrawler discovery server
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
And then there's a "fourth" way, which actually isn't for finding ODs, but the files within them (because that's often what you're actually after). It's called ODCrawler and it's a search engine for finding links from those ODs that link to the files. So if you're looking for a specific file where you roughly know the name of it, it's a good idea to try using ODCrawler! (full disclosure, I'm one of the guys working on ODCrawler, so I'm biased ^^)