Listed in no particular order. Each community has its own rules and audience, and these change — read each site's guidelines before you post.
Good for: A single, high-visibility launch day
The best-known launch site. Products compete on a daily leaderboard, so a launch is usually planned weeks ahead with a prepared gallery, a maker comment and a community ready to try the product. It covers every kind of tech product, not only developer tools.
Good for: Technical products people can try immediately
Show HN posts let you share something you built with a technical audience that values substance over marketing. Posts work best when readers can try the product without signing up, and when the maker answers questions directly in the thread. Read the Show HN guidelines before posting.
Good for: Pre-launch and early-access startups
A directory focused on early-stage startups looking for beta users. It suits products that are collecting sign-ups or running a waitlist rather than launching a finished version.
Good for: Bootstrapped founders sharing the journey
A community of independent founders. Rather than a launch leaderboard, it rewards transparent posts about building, revenue and lessons learned, which can bring early users and feedback over time.
Good for: Niche audiences that match your product
Subreddits such as r/SideProject, r/startups and language- or framework-specific communities can be a good fit, but each has its own rules on self-promotion. Read the rules, contribute before posting, and frame the post around the problem you solve.
Good for: Developer tools specifically
A launch platform dedicated to developer tools, with a weekly launch format and voting from a developer audience.
Good for: Daily launches of tools and SaaS
A directory and daily launch platform for tools and SaaS products, with a launch calendar and voting.
Good for: Makers already active on Peerlist
Peerlist is a professional network for people in tech; its Launchpad lets members launch projects to that network on a weekly cycle.
Good for: Smaller launches with a longer window
A launch platform aimed at indie makers, where launches run over a longer period than a single day, giving smaller products more time to collect feedback.