Here you have the F-15 Silent Eagle, a classic fighter with special coating and sightly angled surfaces to reduce its radar signature. Check out its completely new weapons bays, integrated in the fuel tanks.
Obviously, this plane won't have the same stealth capabilities of the F-35 Lightning II or the F-22 Raptor, but according to Boeing, it's a low cost version of those amazing fifth generation combat jets, according to Mark Bass, F-15 Program vice president for Boeing:
The F-15 Silent Eagle is designed to meet our international customers' anticipated need for cost-effective stealth technologies, as well as for large and diverse weapons payloads. The innovative Silent Eagle is a balanced, affordable approach designed to meet future survivability needs.
The plane has Digital Flight Control System—which reduces its weight and improves reliability—, anti-radar coating, and redesigned conformal fuel tanks that can hold the weapons inside, from air-to-air missiles to air-to-ground weapons. This allows for two things: It allows to have less surfaces to reflect radar waves—which result in a smaller radar signature—and, if you don't care about the radar, load more weapons, since the wings can carry the standard payload of any F-15 Eagle.