There are a number of nootropics that have been shown to improve cognitive performance for various tasks. Some of the most promising include:

* **Aniracetam:** Aniracetam is a racetam that has been shown to improve memory, learning, and attention. It is also thought to be neuroprotective, meaning that it may help to protect the brain from damage.
* **Piracetam:** Piracetam is another racetam that has been shown to improve cognitive function. It is thought to work by increasing the levels of acetylcholine in the brain, a neurotransmitter that is involved in learning and memory.
* **Oxiracetam:** Oxiracetam is a racetam that has been shown to improve memory, attention, and processing speed. It is also thought to be neuroprotective.
* **Phenylpiracetam:** Phenylpiracetam is a racetam that has been shown to improve cognitive function, motivation, and energy levels. It is also thought to be neuroprotective.
* **Noopept:** Noopept is a newer nootropic that has been shown to improve memory, learning, and attention. It is also thought to be neuroprotective.

It is important to note that these are just a few of the many nootropics that are available. When choosing a nootropic, it is important to consider your individual needs and goals. It is also important to do your research to make sure that the nootropic you choose is safe and effective.

It is also important to note that nootropics are not a cure-all for cognitive problems. They may help to improve cognitive function, but they are not a substitute for a healthy lifestyle and regular exercise.
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