L-theanine is popular, I take it in a pill but Soylent added it to their coffee product. (Edit: NOS energy drinks also include L-theanine.) Others I've seen around include Bacopa monnieri, choline, Rhodiola rosea. More examples here https://nootrobox.com/full-stack

Some of us consume our l-theanine in tea, which also contains caffeine (and some other friendly phytochemicals).

Do you favor a particular kind of tea?

Been a few years but I ran into a coder that bragged to me about working 14 hours straight - regularly - on Adderall. This was during an interview, yeah I passed on that job for some reason.

As it turns out, Adderall is amphetamine.

Modafinil and nicotine. Cocaine too, I imagine, although that's more a sales guy thing.

nicotine through pill, not smoking a cigarette?

Nicotine is best administrated through gum or a transdermal patch. I haven't heard of many people using it in pill form. Nicotine alone is similar to smoking a cigarette, but not identical: cigarettes also contain MAOI inhibitors which have synergistic effects with nicotine.

Just a minor correction, MAOI = MAO inhibitors. MAOI inhibitors is redundant.

Lozenges are also available.

It's interesting to note that apparently nicotine is not addictive without the MOAIs from tobacco smoke.

Are people not concerned about nicotine dependence?

There's also Noopept, which is another stimulant