RQDA

RQDA is an R package for computer assisted qualitative data analysis or CAQDAS. It is installable from, and runs within, the R system, but has a separate window running a graphical user interface (through RGtk2).

In the graphical interface it has the following functions:
 * Import documents from plain text
 * Support non-English documents, Simplified Chinese Character is well-tested under Windows
 * Support character-level coding
 * Memos for documents, codes, coding, project, files etc.
 * Retrieve coding, and easily gets back to the original file. Conditional retrieval is supported as well.
 * Single-file (*.rqda) format, which is basically the SQLite database
 * Categorize codes (tree-like categories are avoided)
 * Categorize files
 * Search files by keywords and can highlight keyword in the open file
 * Show attributes of files, which is useful for content analysis
 * Categorise cases and related attributes of cases (to bridge qualitative and quantitative research)
 * Search information about selected cases from the web
 * Rename files, codes, code categories, cases etc.
 * Write and organize fieldwork journals

Through use of R functions, it can:
 * Import a batch of files
 * Calculate the relation between two codings, given the coding indexes
 * Give a summary of coding and inter-code relationship.
 * Export file/case attributes and show subset of files/cases.
 * Allow for more flexible conditional retrieval.
 * Boolean operations of and, or and not.