morss

If you have a niche SaaS product that somehow embeds in your customer's website, I've been working on a search engine that can help find your competitors' customers. It lets you search over the web's HTML code, basically. While this doesn't let people find you, it can help you find them. There are a couple other companies in this space, with data focused on specific markets (US, Europe, etc). So you could find one that suits your geography. Another thing you can do to find people interested in what you offer is following RSS feeds for keywords of your choice. HN RSS (https://hnrss.github.io) is particularly cool for HN! Tools like RSS Bridge (https://github.com/RSS-Bridge/rss-bridge) and Morss (https://github.com/pictuga/morss) can also help to get RSS feeds from websites that don't provide them and only provide a very trimmed down ones.

you can pay for the one offered by fivefilters.org or you could use https://github.com/pictuga/morss which is open source