Google Docs are great for allowing people to collaboratively build a document, with the ability for people to suggest (and discuss) changes and view revisions and a variety of other useful behaviours. At present, I'm sad to admit, CollaboraOffice isn't quite in the same level (although it's catching up quickly!).
A few weeks ago, I got an unexpected (but very flattering!) request from a friend and colleague's son, Felix. He wanted to interview me about my work (at 11, he thinks he might want to become a software developer, too, when he's older) as material he could present at an up-coming PechaKucha session at his school... Wow, we didn't do PechaKucha when I was a kid :)
Dropbox is the best known of the end-user "cloud storage" services for documents, backups, and synchronising data among multiple devices, although now Google's Drive and Microsoft's OneDrive are functionally similar and are being heavily promoted and tied into all sorts of services.
LimeSurvey is an open source survery tool, functionally similar to far more heavily marketed proprietary tools like SurveyMonkey and Google Forms. It's a very mature, fully-featured system. You can either use the reasonably priced hosted service available on the LimeSurvey site, or you can host your own, holding your own data and collecting your own analytics if you prefer. The only cost of hosting your own is your time to set it up and any costs associated with your hosting environment (which, today, can be negligible).
Here at the OERu, we provide a service, attached to all of our online courses (and available to all of our partners - or anyone else for that matter) which allows anyone involved in those courses to communicate with one another from any one of a dazzling array of online "places" with WikiEducator Notes (aka WEnotes). The entire system is free and open source software (FOSS).
One of the OERu's most compelling technological capabilities is the set of internally developed open source tools that allow us to automatically transform and inject a collection of MediaWiki content on WikiEducator (usually in form of micro-courses) making up a course into a mobile-friendly, easy-to-navigate WordPress site, usually situated on OERu's Course WordPress Multisite implementation.
A few months back, I posted instructions on deploying Rocket.Chat and Wekan instances (and their mutual dependency, MongoDB) individually. Since then, I've spent some time with Docker Compose, a set of scripts which help you to define, build, and manage a set of Docker containers. Docker Compose is a thing of beauty. This is the way I now deploy Rocket.Chat, Wekan, and MongoDB together.
SkFor any website that requires anyone (users or even just a few admins) to transfer secrets to and from it, you want to ensure the data is end-to-end encrypted. Today various browsers (like Firefox) give warnings when you're sending secret data (like passwords) "in the clear", namely unencrypted.