ChibiOS/RT supports several external libraries through support interfaces and/or demos. Credit should be given to the original authors for making available such useful code.
The current list of supported component is:

uIP, by Adam Dunkels at the Swedish Institute of Computer Science, link.
lwIP, many authors, link.
FatFs, by "ChaN", link.

External components and libraries are not directly supported and are used "as is" or with minor integration patching.