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europages - More than a simple directory, Europages, the directory of European companies is a professional portal that encourages business-to-business exchanges. Europages is the business directory leader!
DocFX - A documentation generation tool for API reference and Markdown files!
kompass - Kompass business directory: Access to more than 35 million companies in more than 70 countries. A unique tool to find new prospects and clients
Doxygen - Generate documentation from source code
Wer Liefert Was - Find products. Connect with providers. Successfully trade on the leading B2B marketplace