• DocIndexer (Web): https://docindexer.com/ DocIndexer is a popular, web-based docindex that covers a wide range of documentation formats, including APIs, technical documentation, and knowledge bases. It's known for its ease of use, speed, and accuracy.
• DocSearch (Web): https://docsearch.io/ DocSearch is an open-source docindex developed by Algolia, a leading AI-driven search platform. It's designed for large-scale documentation projects and offers advanced features like filtering, faceting, and ranking.
• Datamuse (Web): https://datamuse.com/ Datamuse is a versatile docindex that can handle a broad range of formats, from Markdown to PDF. It's particularly useful for indexing technical documentation, software development resources, and knowledge bases.
• Elasticsearch ( map/reduce): https://www.elastic.co/ Elasticsearch is a popular, open-source search and analytics engine that can be used as a docindex. It offers advanced features like faceting, filtering, and ranking, making it suitable for large-scale documentation projects.

Keep in mind that each docindex has its strengths and weaknesses, and the choice ultimately depends on your specific requirements and use case. When evaluating a docindex, consider factors like:

• Supported formats
• Search functionality
• Indexing speed
• Customization options
• Integration with your existing tools and workflows