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:
(NOTE: some of the dependencies are provided by the XLConnectJars package dependency)

- Apache POI: http://poi.apache.org/
  Related JARs: poi-*.jar, poi-ooxml-*.jar, ooxml-schemas-*.jar

- Apache XMLBeans: http://xmlbeans.apache.org/
  Related JARs: xmlbeans-*.jar

- Joda-Time: http://www.joda.org/joda-time/
  Related JARs: joda-time-*.jar

- Apache Commons Codec: http://commons.apache.org/proper/commons-codec/
  Related JARs: commons-codec-*.jar

- dom4j: http://dom4j.sourceforge.net/
  Related JARs: dom4j-*.jar

- StAX: http://stax.codehaus.org/
  Related JARs: stax-api-*.jar

- XML Commons External Components XML APIs: http://xml.apache.org/commons/#external
  Related JARs: xml-apis-*.jar


See also associated copyright information in inst/COPYRIGHTS. 
