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.
AnnounceKit - Announce product updates like a boss 😎
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
Headway - Keep customers in the loop about your product.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
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.
Integrity - Feature comparison of link checkers for Mac: Integrity, Integrity Plus and Scrutiny