SideProjectors.com is a site focused on trading and showcasing projects. Start the submission with the big red button next to your avatar. With submitting your project you can select which option you prefer.
Neat is the option to import your projects directly from ProductHunt. This saves you from the need to re-enter everything. I recommend replacing the imported project URL (e.g. https://www.producthunt.com/r/89cb26526d7c04) with the URL to your project - this ensures you aren't sending traffic needlessly to a redirect (bad for SEO).
Submissions are manually approved and might take a bit of time. So it makes sense to submit directly after you've launched on ProductHunt. Examples of my previous submissions are:
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