You can browse the Stackdb documentation online (HTML and PDF) formats.

• HTML, multiple pages: About, Install, User Guide, Hacker Guide
• HTML, single page: All-in-one
• PDF, multiple documents: User Guide, Hacker Guide
• PDF, single page: All
• Doxygen auto-generated API listings: Index, Data Structures, Functions

You can also simply read the plain text source files in the doc/ subdirectory in the Stackdb source tree.

Finally, you can rebuild the HTML and PDF documents in the source tree in the doc/ sudirectory by typing make (you must have pandoc, pdflatex, and doxygen installed).