Other

Name: Input Cover Controller
Vendor: Tindie
Manufacturer: FairywrenTech
Price: $20.00
Link: https://www.tindie.com/products/crimier/framework-input-cover-controller/
Notes: Lets you use a Framework Input Cover as a USB keyboard&touchpad, all features supported.

Name: Mainboard Power Button Shim
Vendor: Tindie
Manufacturer: FairywrenTech
Price: $8.00
Link: https://www.tindie.com/products/crimier/framework-mainboard-power-button-shim/
Notes: Get power button, a USB 2.0 port and backlight/capslock/fingerprint LED outputs out of Framework Mainboard input connector.

USB Modules

Name: UART Expansion Card
Vendor: Lectronz.com
Manufacturer: i2c Labs
Price: $14.20
Link: https://lectronz.com/products/uart-expansion-card
Notes: Also appears to be available on Tindie
Name: USB-A-ugment Expansion Card
Vendor: Tindie
Manufacturer: FairywrenTech
Price: $20.00
Link: https://www.tindie.com/products/crimier/framework-laptop-usb-a-ugment-expansion-card/
Name: openCom LTE
Vendor: Liberated Embedded Systems
Manufacturer: Liberated Embedded Systems
Link: https://store.liberatedsystems.co.uk/product/opencom-lte/
Notes: Product page is live but it doesn't appear to be available to buy yet.