Sblam! Alternatives, Similar

Sblam!
Open-source implementation of server-side spam filtering of blog comments and forum posts.
It's available as a free web service. It's open source, so you can set up your own server if you prefer.
It's transparent to end users, and thus perfectly accessible and compatible with all browsers.
All Sblam! Alternatives
reCAPTCHA
reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows. About 200 million...
StopForumSpam
Your favorite and most trusted "one stop shop" for the prevention of forum & blog spam, trusted by over 200,000...
GeeTest CAPTCHA
GeeTest protects your websites, mobile apps and APIs from bad bot attacks with zero user friction. Its self-learning defense model...
OOPSpam API
OOPSpam API is a powerful machine learning based spam filter service for any content exchange. OOPSpam API allows developers to...
UniqPin
UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect a human or a computer...
Akismet
Akismet checks your comments and contact form submissions against our global database of spam to prevent your site from publishing...
Antispam Bee
Say Goodbye to comment spam on your WordPress blog or website. Antispam Bee blocks spam comments and trackbacks effectively, without...
CleanTalk
Anti-Spam Features. CleanTalk protects your website from spam bots and spam in Comments, Orders, Widgets, Registrations, Bookings, And any custom...
Anti-spam
Anti-spam plugin blocks automatic spam in comments section. No captcha. Plugin is easy to use: just install it and it...
CF7 Honeypot
This simple addition to the wonderful Contact Form 7 (CF7) plugin adds basic honeypot anti-spam functionality to thwart spambots without...
Sblam! About
Open-source implementation of server-side spam filtering of blog comments and forum posts.
It's available as a free web service. It's open source, so you can set up your own server if you prefer.
It's transparent to end users, and thus perfectly accessible and compatible with all browsers.