Linkedin is a classifieds board: you post an ad and include your website URL.
Directories with a public submission form
These sites take a URL through a form rather than a public profile or a guest article.
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Listia is a classifieds board: you post an ad and include your website URL.
Localstack is a public directory that still takes your website URL.
Locanto is a classifieds board: you post an ad and include your website URL.
Lonelyplanet is a classifieds board: you post an ad and include your website URL.
Loopnet is a classifieds board: you post an ad and include your website URL.
Loot is a classifieds board: you post an ad and include your website URL.
Made In China is a classifieds board: you post an ad and include your website URL.
Magicbricks is a classifieds board: you post an ad and include your website URL.
Manta is a classifieds board: you post an ad and include your website URL.
Marktplaats is a classifieds board: you post an ad and include your website URL.
Meesho is a classifieds board: you post an ad and include your website URL.
Mercadolibre is a classifieds board: you post an ad and include your website URL.
Mercari is a classifieds board: you post an ad and include your website URL.
Milanuncios is a classifieds board: you post an ad and include your website URL.
Mobile is a classifieds board: you post an ad and include your website URL.
Monster is a classifieds board: you post an ad and include your website URL.
Mudah is a classifieds board: you post an ad and include your website URL.
Mybuilder is a classifieds board: you post an ad and include your website URL.
N49 is a public directory that still takes your website URL.
Naukri is a classifieds board: you post an ad and include your website URL.
Newegg is a classifieds board: you post an ad and include your website URL.
Nobroker is a classifieds board: you post an ad and include your website URL.
Offerup is a classifieds board: you post an ad and include your website URL.
When a submission form is the right door
A form is the usual path for product directories: you send a URL, a short description, and often a logo. Approval is not automatic, and the link can be dofollow or nofollow.