The Java software Discourse Network Analyzer (DNA) is a qualitative content analysis tool with network export facilities. You import text files and annotate statements that persons or organizations make, and the program will return network matrices of actors connected by shared concepts. There is also an R package called rDNA for integration with the statistical computing environment R.
Download the software: https://github.com/leifeld/dna/releases
Check out the WIKI for more information: https://github.com/leifeld/dna/wiki
If you have questions or want to report bugs: https://github.com/leifeld/dna/issues