Alinto / sogo
SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.
phw198 / OutlookGoogleCalendarSync
Sync your Outlook and Google calendars
O365 / python-o365
A simple python library to interact with Microsoft Graph and Office 365 API
vgrem / office365-rest-python-client
Microsoft 365 & Microsoft Graph Library for Python
bkaankose / Wino-Mail
Built-in Mail & Calendars app clone for Windows.
add2cal / add-to-calendar-button
Reliably create beautiful Add to Calendar Buttons, where people can add events to their calendars. Without the hustle and unsupported cases.
ridafkih / keeper.sh
Calendar sync tool & universal calendar MCP server. Aggregate, sync and control calendars on Google, Outlook, Office 365, iCloud, CalDAV or ICS.
wavebox / waveboxapp
Wavebox, the revolutionary and feature-rich Chromium browser that's built for productive working across Google Workspaces, Microsoft Teams, ClickUp, Monday, Atlassian, Asana, AirTable, Slack, and every other web app you use to get work done.
LainsNL / OutlookRegister
Outlook 注册机
vsme / chinese-days
中国法定节假日、调休和工作日、24节气查询，农历阳历互转，提供 JSON 文件，对非开发者，还提供 iCal 日历订阅，可供 Google Calendar、Apple Calendar、Microsoft Outlook 等客户端使用。
bbottema / simple-java-mail
Simple API, Complex Emails (Jakarta Mail smtp wrapper)
daimon3332 / OutlookRegister
Outlook/Hotmail account batch registration tool. Outlook / Hotmail 账号批量注册工具，支持自动获取 OAuth2 refresh_token
nwuzmedoutlook / university
:octocat:120+国内高校课程资源纯手工整理，欢迎补充、修订
lxf746 / outlook-auto-register
Microsoft Outlook Fluent Web API 协议注册工具（纯协议，无浏览器依赖）
microsoft / mfcmapi
MFCMAPI
TeamMsgExtractor / msg-extractor
Extracts emails and attachments saved in Microsoft Outlook's .msg files
mguessan / davmail
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
NetOfficeFw / NetOffice
🌌 Extend and automate Microsoft Office applications using NetOffice framework.
aayushch / laya
Laya is an open-source, local-first AI notification command center that aggregates Slack, Gmail, GitHub, Jira, Notion, Outlook, Calendar (and more) notifications using local LLMs via Ollama and LM Studio. Supports cloud models via BYOK.
cyberdefenders / email-header-analyzer
E-Mail Header Analyzer
AnandChowdhary / calendar-link
📅 Calendar link generator for popular services
acro5piano / react-native-big-calendar
gcal/outlook like calendar component for React Native
Sicos1977 / MSGReader
C# Outlook MSG file reader without the need for Outlook
dennisklappe / CloudMeet
Open-source Calendly alternative running on Cloudflare's free tier. Meeting scheduler with Google Calendar and Outlook sync.
julian-alarcon / prospect-mail
Prospect is an Outlook mail desktop client powered by Electron
rustmailer / rustmailer
A self-hosted Email Middleware for IMAP, SMTP, Gmail API, Graph API — built for developers
ldbumble / taskuary
Your work, already underway. A personal AI assistant for your job: mail, chats and tickets become tasks, the agents you already use (Claude Code, Codex, Gemini) do the work, and nothing goes out until you approve. Open source, runs on your machine.
daimon3332 / OutlookManage
Outlook/Hotmail local account management WebUI supports batch account import, status detection (alive/banned), token refresh and synchronization.Outlook / Hotmail 本地账号管理 WebUI，支持账号批量导入、状态检测（存活/封禁）、令牌刷新与同步。
daimon3332 / Outlook-Oauth-GetToken
A standalone OAuth2 refresh_token retrieval tool for existing Outlook / Hotmail accounts. 面向已有 Outlook / Hotmail 账号的独立 OAuth2 refresh_token 获取工具
dungoutlook1 / ai-super-model
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UCS-Care-Group / mailcraft
MailCraft: an open-source, clean-room mail, calendar and contacts program (Outlook-style) in pure Rust, for Microsoft 365, Outlook.com and IMAP. Early alpha.
A1me7n / outlook-re
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yb1320057104 / OutlookRegisterPlus
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MonkeySaint / mailcraft
An open-source, clean-room reimplementation of Microsoft Outlook (classic) in pure Rust
percentwasphose / itmo-schedule-calendar
Расписание ИТМО в календаре: ICS-подписка и read-only CalDAV для Apple Календаря, Google Календаря, Thunderbird, DAVx⁵, Outlook, Nextcloud и Android.
dengyie / one-mail
Unified inbox: aggregate QQ/163/Gmail/Outlook mail via VPS aggregator into one Cloudflare Worker API — 统一收件箱系统
Limitinfinitude / zcode-pool
ZCode account pool desktop app: mailbox library, batch Z.ai signup + email verification via Microsoft Graph, multi-account switching. Tauri 2 (Windows/macOS/Linux).
NevinPBTH / Microsoft-365-Professional
Professional Microsoft 365 office suite for Windows. Word, Excel, PowerPoint, Outlook and other productivity tools in one package.
promaaa / sync-calendar-omarchy
Chronica: calendar & clock for the Omarchy bar. Two-way sync with Google, CalDAV (iCloud, Nextcloud) and JMAP (Fastmail); read-only .ics feeds (Proton, Outlook); reminders, meeting join, offline calendar.
vow132 / outlook-auto-register
Outlook registration and account operations console with proxy pool, batch jobs, and monochrome glass UI
MasterAlanLab / emailbox
批量邮箱托管与统一收件箱，支持 outlook、qq、163 等主流邮箱 | Bulk email account manager over Graph / IMAP
MMV2408 / tabchat
WhatsApp, Discord, Teams, Outlook, OneDrive and Brightspace in one window with tabs. Made for Linux.
thehijacker / hmelj
Self-hosted webmail client for IMAP/SMTP, Microsoft 365 and Exchange. Multi-account, multi-user, PWA + Android app.