Skill comparison
Use this as a shortlist, then open the skill detail page before adopting.
Decision summary
Strongest overall
BillionMail
Use this as a leading candidate, then validate the README and install path in your own agent stack.
Fastest prototype
BillionMail
Best first install candidate based on install readiness and adoption.
Freshest repo
React Calendar
Most recent maintenance signal among this shortlist.
| Signal | Carbon A simple, semantic and developer-friendly time package for golang | React Calendar Ultimate calendar for your React app. | Leantime Leantime is a goals focused project management system for non-project managers. Building with ADHD, Autism, and dyslexia in mind. | BillionMail 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 |
|---|---|---|---|---|
| Quality | 100/100 Excellent | 100/100 Excellent | 100/100 Excellent | 100/100 Excellent |
| Decision verdict | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. | 100/100 Production-ready Use this as a leading candidate, then validate the README and install path in your own agent stack. |
| Adoption | 5.2K stars Verified outcomes are shown on each skill page | 3.8K stars Verified outcomes are shown on each skill page | 10K stars Verified outcomes are shown on each skill page |
| 15K stars Verified outcomes are shown on each skill page |
| Freshness | Jun 12, 2026 | Jul 27, 2026 | Jun 14, 2026 | Jun 11, 2026 |
| Use-case fit |
| Workflow fit |
| Platform hints | Go, Calendar, Claude Code | TypeScript, Calendar, Claude Code | PHP, Calendar, Claude Code | Go, Email, Claude Code |
| Warnings | No major risk signals from current metadata | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet |
| Best for | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals |
| Not ideal for | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review |
| OpenAgentSkill engagement | 14 views 0 install copies | 0 views 0 install copies | 0 views 0 install copies | 0 views 0 install copies |
| Install | $ npx skills add dromara/carbon | $ npx skills add wojtekmaj/react-calendar | $ npx skills add Leantime/leantime | $ npx skills add Billionmail/BillionMail |