Microsoft Outlook

Flectar Mail is a native, open-source email, calendar, and contacts client built with Rust. It uses a local-first data path, stores synced mail and calendar data locally for offline use, and connects to Gmail, Outlook, Microsoft 365, IMAP/SMTP, JMAP, CalDAV, and CardDAV services. Instead of opening email in a WebView, Flectar Mail renders HTML and CSS through Blitz, a Rust renderer from the Dioxus team. It does not execute email scripts and blocks remote images by default; HTML rendering remains experimental, so complex messages may display incorrectly. The client also provides local access to attachments and WebDAV/JMAP files, account signatures, and desktop OpenPGP/MIME signing and encryption through installed GnuPG 2.x. The project is licensed under the GNU Affero General Public License v3. It provides desktop builds for Linux, Windows, and macOS, plus an experimental Android APK, and can be built from source with Rust. It is currently in development and not yet stable; early releases require users to configure their own OAuth applications for Gmail and Outlook or use IMAP/JMAP accounts.

Outreachr is a free, open-source, local-first fundraising CRM for founders. It provides a private desktop workspace backed by a founder-owned SQLite database rather than an Outreachr-hosted account or subscription, covering investor research, target ranking, introductions, outreach, meetings, diligence, and committed capital. The application searches bundled investor research, ranks targets against factors such as stage, sector, geography, and published check evidence, and shows the supporting records and sources behind each score. Founders can move firms through research, introductions, meetings, diligence, soft-circle, commitment, pass, and not-now stages; draft, review, approve, and send one-to-one initial messages through Gmail or Outlook; and reconcile selected relationship metadata from existing mailboxes. Its outreach controls include duplicate-send prevention, sending caps, domain cooldowns, suppression lists, and founder approval before messages reach a mail provider. Codex or Claude may propose drafts, research, tasks, and pipeline changes from explicitly permitted local context, but agents cannot send email or bypass approval.

Gmail is an email service developed and operated by Google that provides web-based email, POP/IMAP access, storage, spam filtering, and integration with other Google services. It was launched in 2004 and is available for individual and enterprise (Google Workspace) users.

Open Archiver is a self-hosted, open-source platform for archiving, storing, indexing, and searching email from Google Workspace, Microsoft 365, IMAP inboxes, PST files, zipped EML files, and Mbox files. It supports bulk imports and ongoing synchronization, and provides full-text search across messages and attachments with filters and thread discovery. Messages are stored as standard EML files with deduplication, compression, and encryption at rest. Storage can use a local filesystem or an S3-compatible object store. The system records file hashes during ingestion and provides integrity reports, retention policies, and an immutable audit trail for access and activity tracking. The platform is deployed with Docker Compose and uses SvelteKit, Node.js with Express and TypeScript, BullMQ with Redis or Valkey for asynchronous jobs, Meilisearch for indexing, and PostgreSQL for metadata, users, and audit logs.

Mailflare is a self-hosted email inbox for custom domains, built on Cloudflare. It provides domain connection and Cloudflare Email Routing setup, personal and shared mailboxes with delegated access, message composition and receiving with attachments and rich formatting, and organization tools such as search, folders, stars, snoozing, archiving, spam, and trash. Routing rules can store, forward, reject, or categorize incoming messages. When deployed to Cloudflare, Mailflare uses Email Routing for inbound delivery, Cloudflare's email service for outbound messages, a D1 database for mail data, and an R2 bucket for attachments. It can also run as a Docker container using SQLite and local files, with a built-in SMTP listener or a Cloudflare relay Worker for inbound mail and an SMTP relay or Cloudflare Email Sending for outbound mail. The project also includes account and permission management, API keys, webhooks, audit logs, backups, import and export, contacts, and sender blocking.