§1

Research & Standards

iCal Dependency Graph

A formal dependency graph for RFC 5545 VEVENT properties: 27 properties, 20 edges, and merge-safety classifications for sync engines that need to reconcile edits without corrupting an event.

DOI IETF I-D Source CC BY 4.0
§2

Developer Tools

abapctl

A control plane for SAP ABAP: the deterministic CLI that connects your terminal, scripts, and AI agents to SAP's development interfaces over HTTPS. Reads, writes, checks, and activates code through ADT; drives OData services; and remediates for Clean Core. Every command is audit-logged and speaks --json.

TypeScript CLI MIT-0

iCloud Calendar MCP

An MCP server that gives AI agents read and write access to iCloud Calendar. On the MCP Registry, npm, and PyPI.

Kotlin MCP Registry

iCalDAV

A Kotlin CalDAV client with offline support and conflict resolution. The sync core that keeps local edits and server state in agreement.

Kotlin Apache-2.0

ai-agent-dev-workflow

A complete development workflow for Claude Code: spec, plan, review, implement, verify, bundled as one plugin.

Plugin Apache-2.0

sap-atc-checker

Run SAP ATC checks with any check variant through the ADT API, as a Claude Code skill.

TypeScript Apache-2.0
§3

Apps

KashCal

On F-Droid

An offline-first Android calendar that pulls iCloud, CalDAV, holidays, and contact birthdays into one place. Private by default: no account, no tracking.

Kotlin Apache-2.0

KashCake

Birthday reminders drawn straight from your contacts, so a celebration never slips past you. Stays on your device.

Kotlin Apache-2.0