#1
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/leantimeAlternatives
Google Calendar Simple API alternatives for AI agents.
Compare similar skills by workflow fit, trust score, quality, GitHub adoption, maintenance, and install readiness.
Current skill
Google Calendar Simple API
Pythonic wrapper for the Google Calendar API
68
Quality
76
Trust
683
Stars
#2
The best free and open-source automated time tracker. Cross-platform, extensible, privacy-focused.
18K starsJun 11, 2026 pushproductivity-automationPythonProductivity
$ npx skills add ActivityWatch/activitywatch#3
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#4
Low code web framework for real world applications, in Python and Javascript
10K starsJun 16, 2026 pushproductivity-automationPythonEmail
$ npx skills add frappe/frappe#5
A command-line productivity tool powered by AI large language models like GPT-5, will help you accomplish your tasks faster and more efficiently.
12K starsMay 6, 2026 pushproductivity-automationPythonProductivity
$ npx skills add TheR1D/shell_gpt#6
Collect your thoughts and notes without leaving the command line.
7.3K starsMay 28, 2026 pushproductivity-automationPythonProductivity
$ npx skills add jrnl-org/jrnl#7
Insular email distribution - mail server as Docker images
7.3K starsMay 31, 2026 pushproductivity-automationPythonEmail
$ npx skills add Mailu/Mailu#8
A next.js web application that integrates AI capabilities with draw.io diagrams. This app allows you to create, modify, and enhance diagrams through natural language commands and AI-assisted visualization.
32K starsJun 16, 2026 pushproductivity-automationTypeScriptProductivity
$ npx skills add DayuanJiang/next-ai-draw-io#9
Virtual whiteboard for sketching hand-drawn like diagrams
125K starsJun 16, 2026 pushproductivity-automationTypeScriptProductivity
$ npx skills add excalidraw/excalidraw#10
🙃 A delightful community-driven (with 2,500+ contributors) framework for managing your zsh configuration. Includes 300+ optional plugins (rails, git, macOS, hub, docker, homebrew, node, php, python, etc), 140+ themes to spice up your morning, and an auto-update tool that makes it easy to keep up with the latest updates from the community.
188K starsJun 15, 2026 pushproductivity-automationShellProductivity
$ npx skills add ohmyzsh/ohmyzsh#11
The open-source communication infrastructure for agents and products
39K starsJun 16, 2026 pushproductivity-automationTypeScriptEmail
$ npx skills add novuhq/novu#12
The classic email sending library for PHP
22K starsJun 6, 2026 pushproductivity-automationPHPEmail
$ npx skills add PHPMailer/PHPMailer#13
: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#14
💌 Build and send emails using React
19K starsJun 12, 2026 pushproductivity-automationTypeScriptEmail
$ npx skills add resend/react-email#15
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#16
The free and privacy-friendly screen recorder with no limits 🎥
18K starsJun 11, 2026 pushproductivity-automationJavaScriptProductivity
$ npx skills add alyssaxuu/screenityHow 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 Google Calendar Simple API 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.