If you want to publish a work as a pre-print, there are several options available. One popular platform for pre-print publications is arXiv, which covers various fields such as physics, mathematics, computer science, and more. Another well-known platform is bioRxiv, specifically for the biological sciences. Additionally, many disciplines have their own pre-print servers, so it is worth exploring if there is a specialized pre-print server for your field of study.
Regarding publishing in multiple repositories simultaneously, it depends on the policies of each repository. Some repositories allow simultaneous submissions, while others may require exclusivity. It is essential to review the guidelines of each repository to determine if they allow multiple submissions. Additionally, keep in mind that while publishing your work in multiple repositories may increase its exposure, it is important to consider the potential implications, such as potential conflicts with journal publication policies or limitations on subsequent peer review.
To ensure the widest possible exposure for your pre-print, you may also consider sharing your work on social media platforms or academic networking sites. This can help raise awareness among researchers in your field and potentially attract more attention to your pre-print publication.
In summary, I recommend considering well-established pre-print repositories such as arXiv or bioRxiv, exploring specialized pre-print servers for your field, and reviewing the policies of each repository regarding simultaneous submissions. Additionally, promoting your pre-print through social media and academic networking sites can help increase its exposure.