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Zero-config tool for making locally-trusted development certificates. No configuration needed. Works with browsers and system trust stores.

Full-featured toolkit for TLS/SSL protocols and general-purpose cryptography library. Industry-standard for certificate generation and management.

Certificate lifecycle management platform. Issue, renew, and manage certificates from multiple CAs. REST API, ACME support, and web console.

Certificate management framework by Netflix. Centralized certificate issuance and management. Supports multiple CAs and automated rotation.

Elasticsearch, Logstash, and Kibana — the industry-standard log management stack. Ingest, search, analyze, and visualize log data at scale.

Community-driven, open-source search and analytics suite. Fork of Elasticsearch. Includes OpenSearch Dashboards for visualization.

Centralized log management with search, analysis, and alerting. GELF protocol, extractors, pipelines, and dashboards. Free open-source edition.

Open-source data collector for unified logging. 500+ plugins for input/output. Routes logs between systems. CNCF graduated project.

Fast, lightweight log processor and forwarder. Sub-MB footprint for IoT and containers. Part of the Fluentd ecosystem. CNCF project.

Server-side data processing pipeline. Ingests data from multiple sources, transforms it, and sends it to Elasticsearch or other outputs.

Enhanced syslog daemon. Collects logs from various sources, processes messages, and routes to destinations. Supports TLS, filtering, and parsing.

Advanced log file navigator for the terminal. Auto-detects log formats, syntax highlighting, filtering, SQL queries on log data.

Real-time web log analyzer. Terminal and HTML dashboard. Supports Apache, Nginx, Amazon S3, CloudFront, and custom formats.

Centralized structured logging server. Ingest, search, and analyze structured log events. Free single-user edition. Beautiful web UI.

Fast, secure, and easy-to-administer mail transfer agent. Default MTA on many Linux distributions. Handles millions of messages per day.

Open-source IMAP and POP3 email server. High performance, standards-compliant, secure. Supports maildir and mbox formats.

Docker-based mail server suite. Includes Postfix, Dovecot, SOGo groupware, ClamAV, Rspamd, and web admin. Full-featured out of the box.

One-click email server deployment. Sets up SMTP, IMAP, spam filtering, DNS, and webmail on a single Ubuntu server. Self-hosted Gmail replacement.

Full-featured mail server solution. Postfix, Dovecot, SpamAssassin, ClamAV, and web admin. Supports MySQL, PostgreSQL, OpenLDAP backends.

Mail hosting made simple. Modern web interface for managing email domains, accounts, and aliases. Built-in webmail, calendar, and contacts.

Simple yet full-featured Docker-based mail server. Includes SMTP, IMAP, webmail, anti-spam, antivirus, and admin interface.

Free, open-source IMAP webmail client with a desktop-like user interface. Drag-and-drop, MIME support, address book, folder management.

Mature, widely-deployed open-source spam filter. Uses diverse range of tests including header analysis, Bayesian filtering, and DNS blocklists.

Web-based management interface for Postfix virtual domains and mailboxes. Manage domains, aliases, quotas, and vacation auto-replies.