What this free-source list includes
The source list is drawn from active public platform records with a Free cost label. It is a practical starting point for research, not a promise that a site will accept every submission or publish every listing. Availability and submission rules belong to each destination site, so check its current instructions before sending information.
A free listing can still require an account, a review, a reciprocal link, or time to prepare useful copy. A source profile may include a submission link, notes, or other guidance when that information is available. Use those details to understand the next step rather than assuming every source has the same process.
Choose sources that fit your project
Start with relevance. A directory or community should make sense for your product, its users, and the kind of information you can provide. Review the source type, language, and listed link attribute, and treat an unknown attribute as something to verify on the destination itself. Free access alone does not make a source a good fit.
Build a short, focused list before submitting. Read the destination's guidelines, prepare an accurate description, and keep a record of when you applied and what response you received. This makes it easier to follow up without repeating low-quality submissions across unrelated sites.
Turn research into a repeatable workflow
Open a source below to reach its PortBackLinks detail page and inspect the available submission information. You can browse the full backlink sources index to compare more free sources, then use the Backlink Builder to organize form-filling and outreach work. Keep the destination's own rules as the final reference, since third-party websites can change their forms or policies.