https://calendly.com/fr
https://reasondigital.com/insights/integrating-google-calendar-laravel-site/
https://airtable.com/
http://www.bootstrap-year-calendar.com/
https://cal-heatmap.com/
http://eonasdan.github.io/bootstrap-datetimepicker/
http://davidseah.com/page/compact-calendar
http://marcgrabanski.com/code/ui-datepicker/
http://keithdevens.com/software/php_calendar