Blobless, open source wifi firmware for ath9k_htc.ko.
Firmware for Qualcomm Atheros cards which use the ath9k_htc.ko Linux driver, supporting 802.11 abgn on both 2.4ghz and 5ghz bands, 3x3-antenna MIMO, up to 600mbit/sec.
Most devices which use this driver are based on the Qualcomm Atheros AR9271 chip, which is a PCIe device. If your device is connected via USB, it will also include a Qualcomm Atheros AR7010, which bridges from a USB gadget interface to a PCIe host interface. This repository includes the firmware for both chips.
This firmware is completely open source with no blobs, which is quite rare in the wifi world. Wifi chips have their own dedicated general-purpose CPUs. This source code allows you to see what those CPUs are doing and modify their behavior.