This subreddit is all about SaaS (Software As a Service) companies. You can bring up your product as long as it's useful and relevant to the discussion. r/SaaS has 103k members and is among the top 2% of subreddits by size.

r/startups is a subreddit for everything related to startups. Here is how they describe themselves: The community for ventures designed to scale rapidly. Welcome to /r/startups, the place to discuss startup problems and solutions. Startups are companies that are designed to grow and scale rapidly. r/startups has 1.6 million members and is among the top 1% of subreddits by size.