google calendar ical parser, integration

https://fullcalendar.io/releases/fullcalendar/3.9.0/demos/gcal.html
https://gist.github.com/seebz/c00a38d9520e035a6a8c
https://github.com/fullcalendar/fullcalendar/issues/1580

teamviewer alternative, free for commercial use

http://trustviewer.com/en

letsencrypt free sll instalation and usage

https://letsencrypt.org/
https://www.hostinger.com/tutorials/vps/how-to-install-lets-encrypt-ssl-on-vps-running-vebmin-virtualmin#gref
https://helpdesk.ssls.com/hc/en-us/articles/115001610352-How-to-install-a-SSL-certificate-in-Webmin
https://blog.flaunt7.com/how-to-use-lets-encrypt-on-vesta-login-panel/

large file resumable file upload in chunks

http://www.resumablejs.com/
https://github.com/ZiTAL/html5-file-upload-chunk
https://github.com/blueimp/jQuery-File-Upload/wiki/Chunked-file-uploads

https://github.com/flowjs/flow-php-server/blob/master/README.md PHP library for handling chunk uploads.

javascriot variable isolation and module pattern

https://www.nicoespeon.com/en/2013/05/properly-isolate-variables-in-javascript/
https://toddmotto.com/everything-you-wanted-to-know-about-javascript-scope/
https://toddmotto.com/mastering-the-module-pattern/

pipe email to script

https://www.virtualmin.com/node/18059
https://www.virtualmin.com/node/13762
https://serverfault.com/questions/258469/how-to-configure-postfix-to-pipe-all-incoming-email-to-a-script
https://stackoverflow.com/questions/4321159/postfix-and-sending-incoming-emails-to-script-instead-of-sending

http://php-mail-client.github.io/Client/
https://code.google.com/archive/p/imapcopy/  bei imapsync