Apache Mesos abstracts CPU, memory, storage, and other compute resources away from machines (physical or virtual), enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
Mesos is built using the same principles as the Linux kernel, only at a different level of abstraction. The Mesos kernel runs on every machine and provides applications (e.g., Hadoop, Spark, Kafka, Elastic Search) with API’s for resource management and scheduling across entire datacenter and cloud environments.

Sandstorm is an open source operating system for personal and private clouds.
Sandstorm is an open source platform for self-hosting web apps.

Stashboard is a status dashboard for APIs and software services. It's similar to the Amazon AWS Status Page or the Google Apps Status Page. Stashboard was originally written by Twilio to provide status information on its Voice and SMS APIs. Stashboard is designed to provide a generic status dashboard for any hosted service or API. The code can be downloaded, customized, and run on any Google App Engine account.

ONLYOFFICE™ is a multifunctional office suite that enables you to store and co-edit documents, manage projects, email correspondence and customer relations in one place.
ONLYOFFICE comprises three separate servers: Document Server, Community Server and Mail Server. The most reliable way to run them is to use Docker containers. Click the button below to go to Docker Hub and install them all at once.

Sync your files across multiple devices. Share securely with family, friends and co-workers.

Develop, Host, and Scale Your Apps in the Cloud
The Open Hybrid Cloud Application Platform by Red Hat

erOCCI is a framework for building OCCI like API (similar to rOCCI or pyOCNI) for Erlang

Tsuru is an open source polyglot cloud application platform. With Tsuru, you don’t need to think about servers at all. You can write apps in the programming language of your choice, bind it with add-on resources such as SQL and NoSQL databases, memcached, redis, and many others. You manage your app using the Tsuru command-line tool and you deploy code using the Git revision control system, all running on the Tsuru infrastructure.

allow to create workflows between cloud components, à la If this then that (ifttt)

OneSwarm is a P2P file sharing service that protects your privacy.
It's fast, BitTorrent-compatible, and free!

Cozy a personal cloud you can host, hack, and delete

The UNG Project develops a Cloud which is...

Free as in Freedom
Secure as in Privacy
Resilient as the Internet
Standard as the Web
Friendly as our Community

Run any application on demand - Spoon.net App Virtualization

Cloudinary streamlines your web application’s image manipulation needs. Cloudinary’s cloud-based servers automate image uploading, resizing, cropping, optimizing, sprite generation and more.

ownCloud is open source software, built by a vibrant community of people like you!

The Cloud Data Center Management Solution

Open source software for building private and public clouds.

Puppet Enterprise 2.0 gives systems administrators the operational agility, efficiency, and insight they need to manage dynamic infrastructure, on-premise or in the cloud.

Opa is a concise and elegant language for writing distributed web applications.