Fine line between spamming and coincidentally owning or developing a resource that happens to also answer the question
Self-promotion is the act of coming onto a question and throwing your product, service or good like a glove to be worn around a dinner table. While it may be useful, the method in how you answer either tips you as an evangelist of your product that happens to find a question it answers, or a regular spammer.
Disclosure always helps.
Be careful, because the community frowns on overt self-promotion and tends to vote it down and flag it as spam. Post good, relevant answers, and if some (but not all) happen to be about your product or website, so be it. However, you must disclose your affiliation in your answers.
If a huge percentage of your posts include a mention of your product or website, you're probably here for the wrong reasons. Our advertising rates are quite reasonable; contact our ad sales team for details. We also offer free community promotion ads for open source projects and non-profit organizations.