Segundamano 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.
1010 destinations
Sell is a classifieds board: you post an ad and include your website URL.
Servicemagic is a classifieds board: you post an ad and include your website URL.
Serviceseeking is a classifieds board: you post an ad and include your website URL.
Shine is a classifieds board: you post an ad and include your website URL.
Showmelocal is a public directory that still takes your website URL.
Shpock is a classifieds board: you post an ad and include your website URL.
Simplyhired is a classifieds board: you post an ad and include your website URL.
Skillshare is a classifieds board: you post an ad and include your website URL.
Slickdeals is a classifieds board: you post an ad and include your website URL.
Snapdeal is a classifieds board: you post an ad and include your website URL.
Subito is a classifieds board: you post an ad and include your website URL.
Sulekha is a classifieds board: you post an ad and include your website URL.
Superpages is a classifieds board: you post an ad and include your website URL.
Swappa is a classifieds board: you post an ad and include your website URL.
Taobao is a classifieds board: you post an ad and include your website URL.
Taskrabbit is a classifieds board: you post an ad and include your website URL.
Techbargains is a classifieds board: you post an ad and include your website URL.
Thinkific is a classifieds board: you post an ad and include your website URL.
Thomasnet is a classifieds board: you post an ad and include your website URL.
Thumbtack is a classifieds board: you post an ad and include your website URL.
Timesjobs is a classifieds board: you post an ad and include your website URL.
Toptal is a classifieds board: you post an ad and include your website URL.
Totaljobs 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.