H.E.S made cartridges for the atari 2600 they were usually ports of Activision games.

Cartridges were also released for the N.E.S they were unlicensed by Nintendo the cartridge cases came in many different forms some cartridges looked like normal licenced N.E.S cartridges others had a dongle attached. Another style of H.E.S cartridge required you to plug a licensed N.E.S game in one end of the H.E.S cartridge (via a connector) see pic.

Here are some pictures of N.E.S H.E.S boxed games.

H.E.S distributed Atari Lynx products here is a picture of a flyer.