OpenFaaS (Functions as a Service) is a framework for building serverless functions with Docker which has first class support for metrics. Any process can be packaged as a function enabling you to consume a range of web events without repetitive boiler-plate coding. 
<ul>
<li>Ease of use through UI portal and one-click install</li>
<li>Write functions in any language for Linux or Windows and package in Docker/OCI image format</li>
<li>Portable - runs on existing hardware or public/private cloud - <a href="https://github.com/openfaas/faas-netes">Kubernetes</a> and Docker Swarm native</li>
<li><a href="http://github.com/openfaas/faas-cli">CLI</a> available with YAML format for templating and defining functions</li>
<li>Auto-scales as demand increases</li>
</ul>

OpenFaaS (Functions as a Service) is a framework for building serverless functions with Docker which has first class support for metrics. Any process can be packaged as a function enabling you to consume a range of web events without repetitive boiler-plate coding.

OpenFaaS - A serverless framework for Docker & Kubernetes

Serverless helps to build web, mobile and IoT applications with serverless architectures using AWS Lambda, Azure Functions, Google CloudFunctions & more. You can build applications comprised of microservices that run in response to events, auto-scale for you, and only charge you when they run. This lowers the total cost of maintaining your apps, enabling you to build more logic, faster.

Serverless - Build auto-scaling, pay-per-execution, event-driven apps on AWS Lambda

Nuclio is a high-performance "serverless" framework focused on data, I/O, and compute intensive workloads. It is well integrated with popular data science tools, such as Jupyter and Kubeflow; supports a variety of data and streaming sources; and supports execution over CPUs and GPUs. The Nuclio project began in 2017 and is constantly and rapidly evolving; many start-ups and enterprises are now using Nuclio in production.
 
Nuclio is extremely fast: a single function instance can process hundreds of thousands of HTTP requests or data records per second. This is 10-100 times faster than some other frameworks.

Nuclio is a high-performance "serverless" framework focused on data, I/O, and compute intensive workloads. It is well integrated with popular data science tools, such as Jupyter and Kubeflow; supports a variety of data and streaming sources; and supports execution over CPUs and GPUs. The Nuclio project began in 2017 and is constantly and rapidly evolving; many start-ups and enterprises are now using Nuclio in production.

Nuclio - High-Performance Serverless event and data processing platform

Fission is a fast serverless framework for Kubernetes with a focus on developer productivity and high performance.Fission operates on just the code: Docker and Kubernetes are abstracted away under normal operation, though you can use both to extend Fission if you want to.
 
Fission is extensible to any language; the core is written in Go, and language-specific parts are isolated in something called environments (more below). Fission currently supports NodeJS, Python, Ruby, Go, PHP, Bash, and any Linux executable, with more languages coming soon.
 
Fission Concepts 
A function is a piece of code that follows the fission function interface. An environment contains the language- and runtime-specific parts of running a function. A trigger is something that maps an event to a function; Fission supports HTTP routes as triggers today, with upcoming support for other types of event triggers, such as timers and Kubernetes events.

Fission is a fast serverless framework for Kubernetes with a focus on developer productivity and high performance.Fission operates on just the code: Docker and Kubernetes are abstracted away under normal operation, though you can use both to extend Fission if you want to.

Fission - Fast Serverless Functions for Kubernetes

The Fn project is a container native serverless platform that you can run anywhere -- any cloud or on-premise. It’s easy to use, supports every programming language, and is extensible and performant. Fn packages your functions as containers and runs on any platform supporting Docker. Push your functions to a repository and deploy anywhere--your laptop or the cloud. 


Fn - The container native, cloud agnostic serverless platform.

Apache OpenWhisk is a serverless, open source cloud platform that executes functions in response to events at any scale. It is a cloud-first distributed event-based programming service. It provides a programming model to upload event handlers to a cloud service, and register the handlers to respond to various events. 
 
 As a developer there's no need to manage the servers that run your code. Apache OpenWhisk operates and scales your application for you. Spend your time innovating, not configuring infrastructure. Plus, you only pay for what your app uses and needs at that moment. 
 
 Apache OpenWhisk makes it simple for thousands of developers to integrate with your service. Make it easy for developers to perform actions when something happens in your service, or to send data into your service when things happen somewhere else.

Apache OpenWhisk is a serverless, open source cloud platform that executes functions in response to events at any scale.  It is a cloud-first distributed event-based programming service. It provides a programming model to upload event handlers to a cloud service, and register the handlers to respond to various events. 

OpenWhisk - Serverless platform, Distributed event-based programming service

PiCluster is a simple way to manage Docker containers on multiple hosts. Docker Swarm not that good and Kubernetes was too difficult to install currently on ARM. PiCluster will only build and run images from Dockerfile's on the host specified in the config file. This software will work on regular x86 hardware also and is not tied to ARM.
<ul>
<li>Move containers to different hosts in the cluster</li>
<li>Run commands in parallel across Nodes</li>
<li>Heartbeat for services</li>
<li>Easily build and orchestrate Docker images across nodes</li>
<li>Web interface</li>
<li>Monitor host metrics (Disk, CPU, Memory)</li>
<li>HTTP interface</li>
<li>Virtual IP Manager</li>
<li>Rsyslog Analytics</li>
<li>Built-in web terminal to easily run commands on nodes</li>
<li>Integrate the Kibana dashboard into PiCluster</li>
<li>Integrates with Elasticsearch to store the PiCluster logs.</li>
<li>Automatic container failover to different nodes</li>
<li>Pull container images from a registry</li>
<li>Upload Dockerfile archives to the entire cluster</li>
<li>Functions-as-a-Service (FaaS)</li>
</ul>

PiCluster is a simple way to manage Docker containers on multiple hosts. Docker Swarm not that good and Kubernetes was too difficult to install currently on ARM. PiCluster will only build and run images from Dockerfile's on the host specified in the config file. This software will work on regular x86 hardware also and is not tied to ARM.

PiCluster - Manage Docker Containers

Funktion is an open source event driven lambda style programming model on top of Kubernetes. This project provides a command line tool for working with Funktion. It supports hundreds of different trigger endpoint URLs including most network protocols, transports, databases, messaging systems, social networks, cloud services and SaaS offerings.
 
In a sense funktion is a serverless approach to event driven microservices as you focus on just writing funktions and Kubernetes takes care of the rest. Its not that there's no servers; its more that you as the funktion developer don't have to worry about managing them.

Funktion is an open source event driven lambda style programming model on top of Kubernetes. This project provides a command line tool for working with Funktion. It supports hundreds of different trigger endpoint URLs including most network protocols, transports, databases, messaging systems, social networks, cloud services and SaaS offerings.

Funktion -  open source event based lambda programming for kubernetes

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OpenFaaS - A serverless framework for Docker & Kubernetes

Serverless - Build auto-scaling, pay-per-execution, event-driven apps on AWS Lambda

Nuclio - High-Performance Serverless event and data processing platform

Fission - Fast Serverless Functions for Kubernetes

Fn - The container native, cloud agnostic serverless platform.

OpenWhisk - Serverless platform, Distributed event-based programming service

PiCluster - Manage Docker Containers

Funktion - open source event based lambda programming for kubernetes

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