Here we discuss all things Pmod related.
Pmod is a connector and interface standard developed and documented by Digilent.
Here are some useful links:
If you have questions about existing Pmods or want to share a Pmod that you have created, this is the place for you! 
Here are a few more places where PMODs are sold or built:
https://www.infineon.com/cms/en/search.html#!term=pmod&view=products
https://digilent.com/shop/boards-and-components/system-board-expansion-modules/pmods/
https://www.renesas.com/us/en/software-tool/quick-connect-iot-platform
https://www.tindie.com/stores/johnnywu/
https://1bitsquared.com/collections/fpga
https://www.tindie.com/search/?q=pmod
https://lectronz.com/products/search?q=pmod
https://www.aries-embedded.com/evaluation-kit/tools/pmod-extension-module
https://github.com/wuxx/icesugar/tree/master/schematic
https://machdyne.com/?s=pmod&post_type=product
https://aliexpress.com/store/912189181/search?SearchText=pmod
https://github.com/swetland/ethernet-pmod
https://fpga.fm4dd.com/
https://github.com/icebreaker-fpga/icebreaker-pmod
Note how many silicon provider there are! Pmods are quite universal!
[EDIT: I can only put 2 links per post, so here are URLs in a code block. Sorry! Note: I do not sell any of these Pmods: not an advertising :)]