Recoll user manual

• English, HTML, many pages
• English, HTML, one page
• 中文，HTML
• English, PDF
• Italian (rather old)

Other documentation

• Indexing PDF XMP-metadata: a nice exemple of customizing a Recoll configuration and the PDF filter to use additional metadata, by Jeffrey Dick.
• Index size and indexing performance data.
• Result list format samples.
• Lessons learned while modifying Recoll indexing to be multithreaded.
• Faqs and Howtos are now kept in the Recoll Wiki on bitbucket.org.