These are the Epson TM Series receipt printer drivers for CUPS
They are distributed under the GPL version 2.

Epson's new support site (https://epson.sn/) does not seem
to list them.

Supported Models are as follows:

Impact Receipt:
TM-U220

Impact Slip:
TM-H6000V

Thermal Receipt:
TM-H6000V, TM-m10, TM-m30, TM-m30II, TM-m30II-H, TM-m30II-NT,
TM-m30II-S, TM-m30II-SL, TM-m30III, TM-m30III-H, TM-m50,
TM-m50II, TM-m50II-H, TM-T20III, TM-T20IIIL, TM-T20X, TM-T81III,
TM-T82III, TM-T82IIIL, TM-T82X, TM-T83III, TM-T88VI, TM-T88VII,
TM-T100, TM-L100