CMS-Buttler

<p>CMSB Kalender is a lightweight availability calendar for WordPress. It reads events from one Google Calendar iCal URL and displays the current month as available or booked.</p>
<p>Included in this WordPress.org version:</p>
<ul>
<li>Shortcode <code>[cmsbkalender]</code></li>
<li>One Google iCal calendar</li>
<li>Current month display</li>
<li>Free/booked color display</li>
<li>Mobile layout</li>
<li>Optional legend</li>
<li>Custom labels for available and booked days</li>
<li>Server-side iCal loading with configurable cache time</li>
</ul>
<p>Larger CMS-Buttler calendar versions with extended functionality are available as separate products outside this WordPress.org plugin package: https://cms-buttler.de/cmsb-kalender/</p>
<h3>More powerful CMS-Buttler calendar versions</h3>
<p>The WordPress.org version is intentionally focused on a clear and lightweight free/booked month view. It is suitable when you only need to publish basic availability from one Google Calendar.</p>
<p>The larger CMS-Buttler calendar products are separate packages outside this WordPress.org plugin and are designed for halls, clubs, venues, municipalities, rental locations, sports facilities, and organizations that need more control over public availability.</p>
<p>Compared with many simple calendar plugins, the larger CMS-Buttler calendar versions focus on privacy-conscious occupancy display instead of publishing every event detail. They can show that a day is booked while hiding names, internal notes, rental details, or private information.</p>
<p>Additional capabilities available in the larger CMS-Buttler calendar products may include:</p>
<ul>
<li>Multiple months instead of only the current month</li>
<li>Half-day and partial-day occupancy with diagonal day display</li>
<li>Configurable split hour for morning and afternoon bookings</li>
<li>Mouseover details for events that are allowed to be public</li>
<li>Privacy rules for private, confidential, and default-visibility Google Calendar events</li>
<li>Keyword-based hiding for event titles and descriptions</li>
<li>Description trimming from an internal marker such as <code>Intern:</code></li>
<li>Optional booked label when hidden event details are suppressed</li>
<li>Extended design controls for colors, borders, legend, navigation, and day shape</li>
<li>Manual synchronization for testing calendar changes immediately</li>
<li>Sync status with information about loaded, skipped, changed, and recurring events</li>
<li>Recurring Google Calendar event handling</li>
<li>Website-side calendar cache clearing without changing the Google Calendar itself</li>
<li>Larger package options for agencies or operators managing more complex calendar setups</li>
</ul>
<p>These larger versions are especially useful when the public website should answer the visitor’s main question quickly: “Is this date available or already booked?” At the same time, internal information can remain inside Google Calendar.</p>
<p>More information is available at https://cms-buttler.de/cmsb-kalender/</p>
<h3>External Services</h3>
<p>This plugin can use Google Calendar / Google iCal when a calendar URL is configured by the site administrator.</p>
<p>Google Calendar / Google iCal:<br />
The plugin requests the iCal URL entered by the site administrator in order to load calendar events. The request is made server-side from the WordPress installation to the configured iCal URL. Data processed by Google depends on the calendar configuration and Google’s policies.<br />
Service provider: Google LLC<br />
Terms: https://policies.google.com/terms<br />
Privacy: https://policies.google.com/privacy</p>


CMSB Kalender

Display Google Calendar availability as a simple free/busy calendar with a WordPress shortcode.

digitaldonkey

Lukas Pawlik

Borislav Angelov

farmer paul

Justas Butkus

hubrik

Nicola Peluchetti

Yani

<p>An event calendar with native iCal / ICS import and export</p>
<h3>Features</h3>
<p>All features are provided in their entirety. <strong>No features are locked behind any add-ons</strong>.</p>
<ul>
<li><strong>Full iCal / ICS import & export</strong>
<ul>
<li>Automatically import external calendars</li>
<li>Categorize and tag imported feeds</li>
</ul>
</li>
<li><strong>Recurring events</strong>, including complex recurrence rules <a href="https://icalendar.org/iCalendar-RFC-5545/3-8-5-3-recurrence-rule.html" rel="nofollow ugc">(RFC 5545)</a></li>
<li>Filtering by category and tag</li>
<li><strong>Calendar sharing</strong> with Google Calendar, Apple iCal, Outlook, and any other system that accepts iCalendar (.ics) feeds</li>
<li>Month, week, day, and agenda views</li>
<li><strong>Upcoming Events</strong> Gutenberg block</li>
<li>Direct links to <strong>filtered calendar views</strong></li>
<li>Color-coded events by category</li>
<li>Featured event images and category images</li>
<li>SEO-optimized event pages</li>
<li>Mobile-friendly and responsive layouts</li>
<li>Embedded <strong>OpenStreetMap</strong></li>
<li>Theme options to customize your calendar appearence</li>
<li>Your calendar can be embedded into a WordPress page without needing to create template files or modify the theme.</li>
</ul>
<p><strong>Import events from other calendars</strong> and offer users the <strong>ability to subscribe to your calendar</strong>.</p>
<p>Importing and exporting iCalendar (.ics) feeds is one of the strongest features of the Event Calendar system. This allows you to manage your websites calendar by providing a public calendar from your Google, Apple or other calendar management software.</p>
<h3>Blocks</h3>
<p>You can embed the calendar by adding a <strong>OSEC Calendar Block</strong> to any page or post. Alternatively there is a shortcode available.</p>
<blockquote>
<p>[!WARNING]<br />
  At this time, only <strong>one calendar per page or post</strong> is supported.</p>
</blockquote>
<p>On the long run it’s planned to have a Rest API to allow the calendar being rendered with more modern frontend tools than the current, outdated, but nice old Bootstrap 3 stuff.</p>
<h3>Shortcodes</h3>
<h4>Calendar Views</h4>
<pre><code>[osec]                       // Default view per settings
[osec view="monthly"]
[osec view="weekly"]
[osec view="agenda"]
[osec view="daily"]
</code></pre>
<h4>Filtering</h4>
<p><strong>By category</strong></p>
<pre><code>[osec cat_name="Holidays"]
[osec cat_name="Lunar Cycles,zodia-date-ranges"]
[osec cat_id="1"]
[osec cat_id="1,2"]
</code></pre>
<p><strong>By tag</strong></p>
<pre><code>[osec tag_name="tips-and-tricks"]
[osec tag_name="creative writing,performing arts"]
[osec tag_id="1"]
[osec tag_id="1,2"]
</code></pre>
<p><strong>By post ID</strong></p>
<pre><code>[osec post_id="1"]
[osec post_id="1,2"]
</code></pre>
<h3>Requirements</h3>
<ul>
<li>WordPress: 6.6 or newer</li>
<li>PHP:
<ul>
<li>PHP 8.2+ required for development</li>
<li>PHP 8.1 may work for production builds when installed with <code>composer install --no-dev</code></li>
</ul>
</li>
</ul>
<h3>Languages</h3>
<p>OSEC supports multiple languages</p>
<h3>This Is a Fork</h3>
<p>OSEC is a fork of the GPL licensed plugin All-in-one-Event-Calendar by Timely. At it’s time a great plugin with a solid but unmaintainable codebase (not all required developer tools where opensourced).</p>
<p>If you love truly open source software and don’t mind to get your hands dirty you should join here. Free people need free software to manage and share events in a selfhosted manner.</p>
<h3>External services</h3>
<p>OSEC may connect to OpenStreetMap to render maps. If you using maps feature make sure you agree with <a href="https://operations.osmfoundation.org/policies/" rel="nofollow ugc">Terms of Service</a></p>
<p>OSEC may connect to OpenStreetMap Nominatim geocoding API. <a href="https://operations.osmfoundation.org/policies/nominatim/" rel="nofollow ugc">Terms of Service</a>.<br />
You may need to switch the servive on a heavy traffic site as Nominatim allows an <em>absolute maximum of 1 request per second</em>.</p>
<p>By default leaflet and leaflet-control-geocoder are loaded from unpkg.com. <a href="https://app.unpkg.com/policies@1.0.1" rel="nofollow ugc">Terms of Service</a>.</p>
<p>You can change using hooks: <code>osec_leaflet_library_alter</code>, <code>osec_leaflet_geocoder_library_alter</code>.</p>
<h3>Migration Notes</h3>
<p>Database structure is not fully compatible with All-in-One Event Calendar v2.3.4</p>
<p>Migration may be possible with manual effort</p>
<p>A standardized upgrade path may be developed if there is demand and contributions</p>
<p>See this <a href="https://github.com/digitaldonkey/open-source-event-calendar/wiki/migration-from-all%E2%80%90in%E2%80%90one%E2%80%90event%E2%80%90calendar" rel="nofollow ugc">wiki</a> for currently known information on migrating.</p>
<h3>Development & Support</h3>
<p>The principle behind this plugin is to be Open Source. Get in touch on <a href="https://github.com/digitaldonkey/open-source-event-calendar" rel="nofollow ugc">GitHub</a> to report issues, propose feature enhancements, and get general guidance for contributing.</p>
<p>Writing this fork was <a href="https://github.com/wp-plugins/all-in-one-event-calendar/compare/master...digitaldonkey:open-source-event-calendar:master" rel="nofollow ugc">a huge effort</a>.</p>
<p>Digitaldonkey believes everybody should be able to set up and manage public calendars.</p>
<p>If you are implementing this plugin for others you should support ongoing development with a <a href="https://www.paypal.com/donate/?hosted_button_id=ZNWEQRQNJBTE6" rel="nofollow ugc">donation</a> or <a href="https://github.com/digitaldonkey/open-source-event-calendar/issues" rel="nofollow ugc">contribution</a>.</p>
<p><a href="https://dri.es/solving-the-maker-taker-problem" rel="nofollow ugc">Be a maker</a>😀</p>
<p>Those wishing to contribute to the development of this project, please see the <a href="https://github.com/digitaldonkey/open-source-event-calendar/blob/master/.github/CONTRIBUTORS.md" rel="nofollow ugc">Development Guide</a> for more information.</p>


Open Source Event Calendar

An event calendar with native iCal / ICS import and export

CMSB Kalender vs Open Source Event Calendar