Dev tools · alternatives · 2026
24 alternatives to Stalwart JMAP/IMAP Server
Distributed JMAP and IMAP server written in Rust.
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Stalwart JMAP/IMAP Server launched in 2022; newer entries below may have overtaken it.
- 1
I am happy to announce Stalwart JMAP [1], an open-source JSON Meta Application Protocol server that aims to be scalable, robust and secure. Some of its key features are: - JMAP Core, JMAP Mail and JMAP over WebSocket full compliance. - IMAP4 rev2/1 support via Stalwart IMAP, an imap-to-jmap proxy [2]. - Scalable and fault tolerant: consensus over Raft, node autodiscovery over gossip and read-only replicas. - RocksDB backend with full-text search support in 17 languages. - OAuth 2.0 authorization code and device authorization flows. - Domain Keys Identified Mail (DKIM) message signing. -…
2022 · github.com · its alternatives →
- 2
Secure & Modern All-in-One Mail Server (IMAP, JMAP, SMTP)
2024 · its alternatives →
- 3
I am happy to announce Stalwart SMTP [1], a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability. It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts. The project has been recently awarded a grant from NLNet and the European Commission's Next Generation Internet program to develop a mail server in Rust. The next step in…
2023 · github.com · its alternatives →
- 4
An ultra-fast, single-binary MCP server written in Rust as a lightweight alternative to Node.js/Python. - StamManif/mcp-stama
Aug 2026 · github.com · its alternatives →
- 5
This is ymawky, a static file web server for MacOS written entirely in ARM64 assembly. It supports GET, PUT, DELETE, HEAD, and OPTIONS requests, and supports Range: bytes=X-Y headers (which allows scrubbing for video streaming). It decodes percent-encoded URLs, strictly enforces docroot, serves custom error pages for any HTTP error response, supports directory listing, and has (some) mitigations against slowloris-like attacks. I’ve also written a more detailed writeup here: https://imtomt.github.io/ymawky/
May 2026 · github.com · its alternatives →
- 6
2018 · github.com · its alternatives →
- 7
I built LocalGPT over 4 nights as a Rust reimagining of the OpenClaw assistant pattern (markdown-based persistent memory, autonomous heartbeat tasks, skills system). It compiles to a single ~27MB binary — no Node.js, Docker, or Python required. Key features: - Persistent memory via markdown files (MEMORY, HEARTBEAT, SOUL markdown files) — compatible with OpenClaw's format - Full-text search (SQLite FTS5) + semantic search (local embeddings, no API key needed) - Autonomous heartbeat runner that checks tasks on a configurable interval - CLI + web interface + desktop GUI - Multi-provider:…
Feb 2026 · github.com · its alternatives →
- 8
- 9
Simple, fast way to find and try any MCP server. No setup.
Feb 2026 · its alternatives →
- 10
Hey HN, this is Will and David from Fortress (https://news.ycombinator.com/item?id=41426998). We use a lot of async Rust internally, and created this library out of a need for an async-aware concurrent hashmap since there weren’t many available in the Rust ecosystem. Whirlwind is a sharded HashMap with a fully asynchronous API. Just as dashmap is a replacement for std::sync::RwLock, whirlwind aims to be a replacement for tokio::sync::RwLock. It has a similar design and performance characteristics to dashmap, but seems to perform better in read-heavy workloads with tokio's…
2024 · github.com · its alternatives →
- 11
MCP Playground▲160MCP Playground is a Postman-style tool for MCP — inspect servers, execute tools live, test your client, all from the browser. Four things in one place: 1. Free hosted MCP servers — four public test servers anyone can point their client at: Echo (connectivity), Auth (Bearer token flow), Error (error handling), Complex (multi-tool schemas).No sign-up, just use the URL. 2. Server inspector — paste any remote MCP server URL, see all its tools/resources/prompts, execute them live, inspect the full JSON-RPC log. HTTP, SSE, and WebSocket all supported. 3. Registry — 10,000+ servers…
Nov 2025 · mcpplayground.io · its alternatives →
- 12
A Language Server Protocol (LSP) implementation for systemd unit files, providing editing support with syntax highlighting, diagnostics, autocompletion, and documentation made with rust.
2025 · github.com · its alternatives →
- 13
Actor runtime and distributed systems framework for Rust - LeonHartley/Coerce-rs
2019 · github.com · its alternatives →
- 14
A crate to protect against malicious JSON payloads. - ADD-SP/json-threat-protection.rs
2024 · github.com · its alternatives →
- 15
High performance secure & portable Rust functions in Node.js
2020 · secondstate.io · its alternatives →
- 16
I wrote this JMAP MCP server that adds email management tools to Claude for searching, reading, and sending emails through FastMail and other JMAP providers in Deno!
2025 · github.com · its alternatives →
- 17OS
Large Language Models (LLMs) are powerful, but they’re limited by fixed context windows and outdated knowledge. What if your AI could access live search, structured data extraction, OCR, and more—all through a standardized interface? We built the JigsawStack MCP Server, an open-source implementation of the Model Context Protocol (MCP) that lets any AI model call external tools effortlessly. Here’s what it unlocks: - Web Search & Scraping: Fetch live information and extract structured data from web pages. - OCR & Structured Data Extraction: Process images, receipts, invoices, and handwritten…
2025 · its alternatives →
- 18
Cypht is a lightweight, open-source webmail client that combines all your email accounts and RSS feeds into one unified, streamlined inbox. Supports IMAP, SMTP, JMAP, and EWS.
2016 · cypht.org · its alternatives →
- 19
I've just released an early version off my project I've been working on for a few months now and would love some feedback. https://github.com/fourlexboehm/faasta I was surprised there isn't yet an open/source and standards compliant way to host wasi-http functions in a way that takes advantages of WASM, a multi tenanted application. If you're not familiar with wasi, Compared to something like AWS Lambda, this approach is much more efficient as a single process can serve 1000s of function invocations concurrently and asynchronously, instead requiring an entire VM.…
2025 · github.com · its alternatives →
- 20
A CLI development tool for WebSocket APIs. Contribute to eliihen/wsta development by creating an account on GitHub.
2016 · github.com · its alternatives →
- 21
Actor runtime and distributed systems framework for Rust - LeonHartley/Coerce-rs
2023 · github.com · its alternatives →
- 22
This is ymawky, a now-dynamic web server written entirely in ARM64 Assembly. I've previously posted about ymawky here: https://news.ycombinator.com/item?id=48080587 In the past month and a half, I've made some pretty major improvements: I've added CGI scripting support, so the server now supports query strings and dynamic content; and I've fully ported ymawky to run on Linux, rather than macOS-only. In addition to GET/PUT/HEAD/DELETE/OPTIONS requests, because of CGI support ymawky also accepts POST requests (only to CGI resources for now). I've also updated…
Jun 2026 · github.com · its alternatives →
- 23
High-performance serverless functions for Rust & WebAssembly
2020 · secondstate.io · its alternatives →
- 24
A self-hosted IMAP/SMTP middleware designed for developers
2025 · rustmailer.com · its alternatives →
Also compare
- Distributed JMAP and IMAP Servers in Rust alternatives
- Stalwart Mail Server alternatives
- SMTP Server in Rust with DMARC, Dane, MTA-STS, Sieve, OTEL Support alternatives
- MCP-stama – An ultra-fast Rust MCP server with no dependencies alternatives
- Building a web server in assembly to give my life (a lack of) meaning alternatives
- Jackal – XMPP server in Go alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →