XLConnect sources can be obtained from GitHub:

- XLConnect R Package: https://github.com/miraisolutions/xlconnect
- XLConnectJars R Package: https://github.com/miraisolutions/xlconnectjars
- XLConnect Java Sources: https://github.com/miraisolutions/xlconnect-java


Sources for other open source software components can be obtained from the corresponding project websites or source code repositories:

- Apache POI: http://poi.apache.org/
  Full Source Distribution: https://www.apache.org/dyn/closer.lua/poi/release/src/poi-src-3.17-20170915.tar.gz
  Source Code by JAR: 
  poi-3.17.jar: http://repo1.maven.apache.org/maven2/org/apache/poi/poi/3.17/poi-3.17-sources.jar
  poi-ooxml-3.17.jar: http://repo1.maven.apache.org/maven2/org/apache/poi/poi-ooxml/3.17/poi-ooxml-3.17-sources.jar
  poi-ooxml-schemas-3.17.jar: Source code auto-generated from OOXML schemas by POI ant task "compile-ooxml-xsds" (see https://poi.apache.org/faq.html#faq-N10025 for more information)

- Curvesapi: https://github.com/virtuald/curvesapi
  Source Code:
  curvesapi-1.04.jar: http://central.maven.org/maven2/com/github/virtuald/curvesapi/1.04/curvesapi-1.04-sources.jar

See also associated copyright information in inst/COPYRIGHTS. 
