Open-source projects categorized as Anti-spam | Edit details

Top 10 Anti-spam Open-Source Projects

  • base64Captcha

    captcha of base64 image string

  • django-simple-captcha

    Django Simple Captcha is an extremely simple, yet highly customizable Django application to add captcha images to any Django form.

    Project mention: Do you guys use reCaptcha (or a similar system)? Which version/product do you use? | | 2021-10-02

    I developed and maintain django-simple-captcha, which makes it dead simple to add captchas to any Django form.

  • SonarLint

    Deliver Cleaner and Safer Code - Right in Your IDE of Choice!. SonarLint is a free and open source IDE extension that identifies and catches bugs and vulnerabilities as you code, directly in the IDE. Install from your favorite IDE marketplace today.

  • invisible_captcha

    :honey_pot: Unobtrusive and flexible spam protection for Rails apps

    Project mention: Rails application boilerplate for fast MVP development | | 2021-08-06

    add invisible_captcha

  • phpMussel

    PHP-based anti-virus anti-trojan anti-malware solution.

  • friendly-challenge

    The widget and docs for the proof of work challenge used in Friendly Captcha. Protect your websites and online services from spam and abuse with Friendly Captcha, a privacy-first anti-bot solution.

    Project mention: Business owners with contact me website pages: What is your "self host" captcha solution? | | 2022-02-14

    I'm personally looking forward to using FriendlyCaptcha or something of that sort, that does a small PoW calculation.

  • Raid-Protect-Discord-Bot

    A Discord Bot that allows you to protect your Discord server with captcha, anti profanity, anti nudity image, anti spam, account age required, logs...

    Project mention: Discord Bot that allows you to protect your Discord server with captcha, anti profanity, anti nudity image, anti spam, account age required, logs... | | 2021-09-02
  • spamscanner

    Spam Scanner is the best anti-spam, email filtering, and phishing prevention service.

    Project mention: Ask HN: Spammers got smarter or Gmail is no longer good? | | 2022-01-25

    Same problem as well; there are so many attack vectors it's absurd.

    I've tried rspamd, SpamAssassin, and so many other alternatives. Then I decided to try writing my own in JS.

    Spam Scanner (work in progress) is at with source code at Trying to do it in a privacy-focused way, which is incredibly challenging to say the least.

    Fortunately we're thinking that with ARF in combination with human curators (privacy-focused where sensitive data is redacted during curation process), and a combination of tech - will make this at least a bit better - and completely open source too.

    We're in the progress of building an SMTP alternative, so we're not just a forwarding service (Forward Email at - and I hope to have Spam Scanner hooked in to individual inboxes as well, so it gets smarter for the individual users as opposed to group-think.

    I'm hoping that we can at least make things a bit smarter with some scrappy measures over time. Hoping to launch SMTP by April so you can use Thunderbird, Apple Mail, or K-9 for instance with your own inbox running Spam Scanner.

  • Scout APM

    Less time debugging, more time building. Scout APM allows you to find and fix performance issues with no hassle. Now with error monitoring and external services monitoring, Scout is a developer's best friend when it comes to application development.


    CIDRAM: Classless Inter-Domain Routing Access Manager.


    UTM Firewall on OpenBSD

    Project mention: Firewalls; old and stable, or next generation | | 2021-06-01

    Look at the UTMFW project:

  • django-simple-spam-blocker

    Simple spam blocker for Django

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2022-02-14.

Anti-spam related posts


What are some of the best open-source Anti-spam projects? This list will help you:

Project Stars
1 base64Captcha 1,454
2 django-simple-captcha 1,236
3 invisible_captcha 933
4 phpMussel 372
5 friendly-challenge 284
6 Raid-Protect-Discord-Bot 172
7 spamscanner 156
9 UTMFW 79
10 django-simple-spam-blocker 24
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