StopForumSpam - StopForumSpam - a database of known forum and blog spam, its sources and the email addresses reported
UserGuiding - User onboarding made easy, for less. Create product walkthroughs in a couple of clicks, without breaking the bank.
Antispam Bee - Say Goodbye to comment spam on your WordPress blog or website.
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
Sblam! - Open-source implementation of server-side spam filtering of blog comments and forum posts.
Userlane - Digital adoption platform with interactive guidance for software applications allowing anyone to understand and master any software from the get-go.