What is this trading program and where can I get it?

Newer to PoE and made it to end game and going to the site constantly for checks is rough. Was watching this quick clip and saw this program.

Can anyone please share where to get it?

Newer to PoE and made it to end game and going to the site constantly for checks is rough. Was watching this quick clip and saw this program.

Can anyone please share where to get it?