A

anti-spam

Phonic is an open-source AI-powered call interception and communication intelligence system that automatically screens incoming calls, blocks robocalls, records and transcribes voicemails, and maintains a complete call log. Built with modern telephony, machine learning, and speech-to-text technologies, it acts as an intelligent privacy layer between users and the phone network, continuously learning to improve spam detection and call handling. https://roxanneardary.com/phonic/

amavis is a high-performance email content filter framework written in Perl.

MailKeeper is a modular, open source AI email assistant designed to help users organize, search, manage, and protect their digital communications. It combines intelligent email classification, sender and company organization, security analysis through EmailXpose, document and receipt intelligence, retention management, unsubscribe assistance, outgoing email protection, contact management, voice and video communication, and human-in-the-loop controls that keep users in charge of consequential actions. https://roxanneardary.com/mailkeeper/

A mail content scanner for postfix written in python

A Django app that provides IP-based blocklisting via middleware. Originally developed for use on https://dpaste.com

Keycloak PoW Extension — adds computational PoW (proof-of-work) challenges to login, registration, and password-reset flows. Protects against bot spam and brute-force attacks by requiring clients to solve a light cryptographic puzzle before authenticating. Uses Argon2 (memory-hard, GPU-resistant) or SHA-256, with IP-adaptive difficulty that scales challenge hardness based on per-IP request patterns. Rate state is stored in Infinispan, enabling shared difficulty tracking across clustered Keycloak instances. Deploy as a standard Keycloak SPI plugin — works with any Keycloak 26.6 instance.

Three-layer defense on every submission:

Honeypot — silently rejects bots that auto-fill all form fields Solve-time validation — rejects submissions arriving faster than configured minimum (default 500ms) Hash verification — verifies proof-of-work correctness and prevents nonce replay attacks

A policy daemon for postfix written in python

DomainVoider is dedicated to providing AdGuard Pro for iOS users with a custom built, privacy & security focused, simplified ad-blocking filter. Included are active malware domains from https://urlhaus.abuse.ch

https://iosprivacy.com/domainvoider

A WPezToolbox bundle of Anti-spam plugins.