#1
The open-source communication infrastructure for agents and products
39K starsJun 16, 2026 pushproductivity-automationTypeScriptEmail
$ npx skills add novuhq/novuAlternatives
OneSignal Flutter SDK alternatives for AI agents.
Compare similar skills by workflow fit, trust score, quality, GitHub adoption, maintenance, and install readiness.
Current skill
OneSignal Flutter SDK
OneSignal makes engaging customers simple and is the fastest, most reliable service to send push notifications, in-app messages, SMS, and emails. This plugin makes it easy to integrate your Fluter app with OneSignal. https://onesignal.com
80
Quality
84
Trust
648
Stars
#2
A Node.js library to send all kinds of transactional notifications.
2.0K starsNov 24, 2025 pushproductivity-automationJavaScriptEmail
$ npx skills add notifme/notifme-sdk#3
Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
14K starsJun 16, 2026 pushproductivity-automationKotlinEmail
$ npx skills add thunderbird/thunderbird-android#4
Prometheus Alertmanager
8.5K starsJun 16, 2026 pushproductivity-automationGoEmail
$ npx skills add prometheus/alertmanager#5
Fully featured, open source, privacy friendly email app for Android
4.4K starsJun 15, 2026 pushproductivity-automationJavaEmail
$ npx skills add M66B/FairEmail#6
Notifications for Ruby on Rails applications
2.7K starsApr 8, 2026 pushproductivity-automationRubyEmail
$ npx skills add excid3/noticed#7
A multi-platform (Flutter) application for reading your emails, with your favorite devices, using the JMAP protocol!
623 starsJun 16, 2026 pushproductivity-automationDartEmail
$ npx skills add linagora/tmail-flutter#8
🎨 Powerful, minimalistic, cross-platform, opensource note-taking app
1.9K starsJun 16, 2026 pushproductivity-automationDartProductivity
$ npx skills add LinwoodDev/Butterfly#9
Decentralized private messenger with chat-shared tools and games for Android
1.7K starsJun 15, 2026 pushproductivity-automationJavaEmail
$ npx skills add deltachat/deltachat-android#10
React Native Calendar Components 🗓️ 📆
10K starsApr 23, 2026 pushproductivity-automationTypeScriptCalendar
$ npx skills add wix/react-native-calendars#11
The classic email sending library for PHP
22K starsJun 6, 2026 pushproductivity-automationPHPEmail
$ npx skills add PHPMailer/PHPMailer#12
: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#13
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#14
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#15
💌 Build and send emails using React
19K starsJun 12, 2026 pushproductivity-automationTypeScriptEmail
$ npx skills add resend/react-email#16
MJML: the only framework that makes responsive-email easy
18K starsJun 12, 2026 pushproductivity-automationJavaScriptEmail
$ npx skills add mjmlio/mjmlHow 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 OneSignal Flutter SDK 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.