If you don't need to launch an entire press release for every feature update, then Beamer is a great way to surface minor updates internally to your platform users. The internal news update that is shown to platform users allows us to add helpful content to logged-in users.
Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.
AnnounceKit - Announce product updates like a boss 😎
Vivoom - Make Every Video Look Better
Headway - Keep customers in the loop about your product.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Changelogfy - Changelogfy is an all-in-one platform to collect, organize and manage customer and teammates feedback, prioritize and build a product roadmap, and announce product updates.