For a nootropic supplement with no stimulants, Clear Edge and the stim-free focus XT are good options. Adaptogens can also really help too, things like rhodiola, ashwagandha, schisandra, and even tongkat ali could all help in various ways with fatigue, mood, stress/anxiety, and/or performance.
As for individual ingredients (besides the ones mentioned above), consider things like choline sources, AChE inhibitors, racetams/Noopept, ALCAR and tyrosine.
Of course, you don't need everything listed above, but hopefully it helps give you an idea of where to start.