Scrimage is a consistent, idiomatic, and immutable scala library for manipulating and processing of images. The aim of the this library is to provide a quick and easy way to do the kinds of image operations that are most common, such as scaling, rotating, converting between formats and applying filters. It is not intended to provide functionality that might be required by a more "serious" image processing application - such as face recognition or movement tracking.
 
A typical use case for this library would be creating thumbnails of images uploaded by users in a web app, or resizing a set of images to have a consistent size, or optimizing PNG uploads by users to apply maximum compression, or applying a grayscale filter in a print application.

Scrimage is a consistent, idiomatic, and immutable scala library for manipulating and processing of images. The aim of the this library is to provide a quick and easy way to do the kinds of image operations that are most common, such as scaling, rotating, converting between formats and applying filters. It is not intended to provide functionality that might be required by a more "serious" image processing application - such as face recognition or movement tracking.

Scrimage - Scala image processing library

Linkerd is a transparent service mesh, designed to make modern applications safe and sane by transparently adding service discovery, load balancing, failure handling, instrumentation, and routing to all inter-service communication.linkerd (pronouned "linker-DEE") acts as a transparent HTTP/gRPC/thrift/etc proxy, and can usually be dropped into existing applications with a minimum of configuration, regardless of what language they're written in. It works with many common protocols and service discovery backends, including scheduled environments like Mesos and Kubernetes.

linkerd - Resilient service mesh for cloud native apps

Lila (li[chess in sca]la) is a free online chess game server focused on realtime gameplay and ease of use. It features a search engine, computer analysis distributed with fishnet, tournaments, simuls, forums, teams, tactic trainer, a mobile app, and a shared analysis board. The UI is available in more than 80 languages thanks to the community.

lichess - Online Chess Game Server

sbt is a build tool for Scala, Java, and more. It can generate documentation with scaladoc, Accurate incremental recompilation using information extracted from the compiler, Parallel task execution, including parallel test execution, Continuous compilation and testing with triggered execution and lot more.

Simple-build-tool - A build tool for Scala

Atlas was developed by Netflix to manage dimensional time series data for near real-time operational insight. Atlas features in-memory data storage, allowing it to gather and report very large numbers of metrics, very quickly. Atlas captures operational intelligence. Whereas business intelligence is data gathered for analyzing trends over time, operational intelligence provides a picture of what is currently happening within a system.

Atlas - In-memory dimensional time series database

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.
 
<ul>
<li>High-performance. Build scalable applications with 100x the performance of Scala's <code>Future</code>.</li>
<li>Type-safe. Use the full power of the Scala compiler to catch bugs at compile time.</li>
<li>Concurrent. Easily build concurrent apps without deadlocks, race conditions, or complexity.</li>
<li>Asynchronous. Write sequential code that looks the same whether it's asynchronous or synchronous.</li>
<li>Resource-safe. Build apps that never leak resources (including threads!), even when they fail.</li>
<li>Testable. Inject test services into your app for fast, deterministic, and type-safe testing.</li>
<li>Resilient. Build apps that never lose errors, and which respond to failure locally and flexibly.</li>
<li>Functional. Rapidly compose solutions to complex problems from simple building blocks.</li>
</ul>

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.

Zio - A type-safe, composable library for async and concurrent programming in Scala 

FlockDB is much simpler than other graph databases such as neo4j because it tries to solve fewer problems. It scales horizontally and is designed for on-line, low-latency, high throughput environments such as web-sites. Twitter uses FlockDB to store social graphs (who follows whom, who blocks whom) and secondary indices. As of April 2010, the Twitter FlockDB cluster stores 13+ billion edges and sustains peak traffic of 20k writes/second and 100k reads/second.

FlockDB - A distributed, fault-tolerant graph database from Twitter

BigBlueButton is an open source web conferencing system for distance education. 

It supports sharing of slides (PDF and any document readable by OpenOffice), webcams, whiteboard, chat, voice over IP (using FreeSWITCH), and presenter's desktop. It can record and playback sessions (slides, audio, and chat), runs on Mac, Unix, and PC computers, and is supported by a community of developers that care about good design and a streamlined user experience. 

 
The use cases for BigBlueButton are One-to-one on-line tutoring, Small group collaboration, 
On-line classes (25 or less)

BigBlueButton is an open source web conferencing system for distance education. It supports sharing of slides (PDF and any document readable by OpenOffice), webcams, whiteboard, chat, voice over IP (using FreeSWITCH), and presenter's desktop. It can record and playback sessions (slides, audio, and chat), runs on Mac, Unix, and PC computers, and is supported by a community of developers that care about good design and a streamlined user experience. 



Bigbluebutton - Open Source Web Conferencing

MLlib is a Spark implementation of some common machine learning algorithms and utilities, including classification, regression, clustering, collaborative filtering, dimensionality reduction and lot more.

MLIB - Apache Spark's scalable machine learning library

Silhouette is an authentication library for Play Framework applications that supports several authentication methods, including OAuth1, OAuth2, OpenID, CAS, Credentials, Basic Authentication, Two Factor Authentication or custom authentication schemes.

Silhouette - Authentication library for Play Framework

Casbah is an interface for MongoDB designed to provide more flexible access from both Java and Scala. The core focus is on providing a Scala oriented wrapper interface around the Java mongo driver.For the Scala side, contains series of wrappers and DSL-like functionality for utilizing MongoDB from within Scala. This currently utilises the very Java-oriented Mongo Java driver, and attempts to provide more scala-like functionality on top of it. This has been tested with MongoDB 1.2.x+ and 2.x of the Mongo java driver.

Casbah is an interface for MongoDB designed to provide more flexible access from both Java and Scala. The core focus is on providing a Scala oriented wrapper interface around the Java mongo driver. For the Scala side, contains series of wrappers and DSL-like functionality for utilizing MongoDB from within Scala. This currently utilises the very Java-oriented Mongo Java driver, and attempts to provide more scala-like functionality on top of it. This has been tested with MongoDB 1.2.x+ and 2.x of the Mongo java driver.

Casbah - Officially supported Scala Driver for MongoDB

ReactiveMongo is a scala driver that provides fully non-blocking and asynchronous I/O operations. It allows you to stream data both into and from your MongoDB servers.

ReactiveMongo - Asynchronous and Non-Blocking Scala Driver for MongoDB

doobie is a pure functional JDBC layer for Scala. It is not an ORM, nor is it a relational algebra; it just provides a principled way to construct programs (and higher-level libraries) that use JDBC. doobie introduces very few new abstractions; if you are familiar with basic scalaz typeclasses like Functor and Monad you should have no trouble here.

doobie -  principled database access for scala

OpenMOLE (Open MOdeL Experiment) makes it simple to execute your programs on distributed computing environments. If you want to execute the same program for many different inputs (parameters or datasets).  The typical usages of OpenMOLE are high performance model calibration, model exploration, machine learning, optimization, data processing. It is a scientific workflow engine that works with your own programs and on your own execution environments.

OpenMOLE - Execute programs on distributed computing environments

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

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