#1
MFCMAPI
970 starsJun 19, 2026 pushproductivity-automationC++Email
$ npx skills add microsoft/mfcmapiAlternatives
Gromox alternatives for AI agents.
Compare similar skills by workflow fit, trust score, quality, GitHub adoption, maintenance, and install readiness.
Current skill
Gromox
Groupware server backend for the grommunio Distribution, supporting MAPI/HTTP, RPC/HTTP, EWS, IMAP, POP3 protocols, PHP-MAPI bindings, and import from PST/OST/MSG/CDFV2/TNEF, EML/ICAL/VCF, Kopano, Zarafa
76
Quality
78
Trust
243
Stars
#2
Sync Outlook with Google, SOGo, Nextcloud or any other CalDAV/CardDAV server
1.1K starsApr 14, 2026 pushproductivity-automationC#Calendar
$ npx skills add aluxnimm/outlookcaldavsynchronizer#3
JMAP Webmail built for the 21st Century. A modern, self-hosted email client for Stalwart Mail Server powered by the JMAP protocol. Email, calendar, contacts and files. Fast, private, and open source.
617 starsJun 15, 2026 pushproductivity-automationTypeScriptEmail
$ npx skills add bulwarkmail/webmail#4
Sync your Outlook and Google calendars
2.1K starsJun 18, 2026 pushproductivity-automationC#Calendar
$ npx skills add phw198/OutlookGoogleCalendarSync#5
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
18K starsJun 15, 2026 pushproductivity-automationJavaScriptEmail
$ npx skills add Foundry376/Mailspring#6
BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr
15K starsJun 11, 2026 pushproductivity-automationGoEmail
$ npx skills add Billionmail/BillionMail#7
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
15K starsMay 24, 2026 pushproductivity-automationPythonEmail
$ npx skills add mail-in-a-box/mailinabox#8
A Cloudflare-based email service | 基于 Cloudflare 的邮箱服务 | Cloudflare Email 邮箱 Mail
11K starsJun 9, 2026 pushproductivity-automationJavaScriptEmail
$ npx skills add maillab/cloud-mail#9
A date and time library based on the C++11/14/17 <chrono> header
3.4K starsApr 16, 2026 pushproductivity-automationC++Calendar
$ npx skills add HowardHinnant/date#10
📇 Synchronize calendars and contacts.
1.8K starsApr 7, 2026 pushproductivity-automationPythonCalendar
$ npx skills add pimutils/vdirsyncer#11
✉️ Composable all-in-one mail server.
6.0K starsMay 26, 2026 pushproductivity-automationGoEmail
$ npx skills add foxcpp/maddy#12
Full-sized drag & drop event calendar in JavaScript
20K starsDec 23, 2025 pushproductivity-automationTypeScriptCalendar
$ npx skills add fullcalendar/fullcalendar#13
Kurrier is a modern, self-hosted workspace for email, calendar, contacts and storage.
980 starsJun 10, 2026 pushproductivity-automationTypeScriptEmail
$ npx skills add kurrier-org/kurrier#14
Leantime is a goals focused project management system for non-project managers. Building with ADHD, Autism, and dyslexia in mind.
10K starsJun 14, 2026 pushproductivity-automationPHPCalendar
$ npx skills add Leantime/leantime#15
React Native Calendar Components 🗓️ 📆
10K starsApr 23, 2026 pushproductivity-automationTypeScriptCalendar
$ npx skills add wix/react-native-calendars#16
Exchange calendars to use with pandas for trading applications
973 starsMay 27, 2026 pushproductivity-automationPythonCalendar
$ npx skills add rsheftel/pandas_market_calendarsHow to choose
When should you switch?
Use an alternative when it has a clearer install path, higher trust score, fresher maintenance, or better platform fit for your current agent stack. Keep Gromox if it already passes your workflow test and repository review.
Next step
Compare top candidates side by side
Open the compare page, test the install commands in a sandbox, and check each repository before using a skill in production.