Minimalist answer: caffeine/coffee (to this day, nothing matches ephedrine products (BRONKAID/PRIMATENE tablets if you're into that strategy for "fat burner" based pre work outs...it's strong PRIMATENE - shorter acting HCl salt >BRONKAID - longer acting sulfate salt. Not to be used chronically - redundant anyways due to inevitable tachyphylaxis - needs cyclical use)

Anti-proprietary blend answer: amazon good ingredients (creatine monohydrate/HCl, beta alanine, citrulline maleate, caffeine, etc.) & compound yourself (flavor with mio/crystal light if needed or just "man up"). Citrulline maleate (as opposed to plain L-citrulline) has a good flavor masking taste by itself (watermelon/intense lemon taste)

Supplement junky/too lazy, time consuming, & tedious to compound answer: PES prolift (weak stimulant, nothing ridiculous vs. yohimbine & DMAA formulations) & PES high volume (non-stimulant based) have been my most recent go-tos (label has grams of each ingredient disclosed). Note: vitamin shoppe has a similar knock-off/generic version (I have yet to try, but looks ok/comparable)

Can not personally comment on various other products (optimum nutrition, scivation, etc.) but ALWAYS check/research the label & grams active ingredient(s) & ask yourself if this company seems reputable/legit