lichess-org / lila

Open source server powering lichess.org, a free, ad-free online chess platform with realtime games, analysis, and tournaments.

OpenXiangShan / XiangShan

Open-source high-performance RISC-V processor core written in Chisel, developed by the XiangShan project.

joernio / joern

Open-source platform that builds code property graphs from source, bytecode, and binaries for querying vulnerabilities with a Scala DSL.

Eezo-framework / eezo

A Scala 3 web framework. Direct-style. The case class is the source of truth. Deploy with one command.

delta-io / delta

An open-source storage framework for building Lakehouse architectures with ACID tables accessible from Spark, Flink, Trino, Presto, and Hive.

THU-DSP-LAB / ventus-gpgpu

GPGPU processor supporting RISCV-V extension, developed with Chisel HDL

ucb-bar / chipyard

Open-source Chisel framework for building agile RISC-V systems-on-chip from cores, accelerators, and peripherals.

scala / scala3

The Scala 3 compiler, standard library, and language specification, also known as Dotty.

TheHive-Project / Cortex

Cortex: a Powerful Observable Analysis and Active Response Engine

twitter / the-algorithm

Source code for the X Recommendation Algorithm

gatling / gatling

Open-source load testing tool where performance test scenarios are written as code in Java, JavaScript, TypeScript, Kotlin, or Scala.

apache / openwhisk

Apache OpenWhisk is an open source serverless cloud platform

scalatra / scalatra

Tiny Scala high-performance, async web framework, inspired by Sinatra

riscv-boom / riscv-boom

SonicBOOM: The Berkeley Out-of-Order Machine

softwaremill / sttp

The Scala HTTP client you always wanted!

apache / carbondata

High performance data store solution

dbpedia / extraction-framework

The software used to extract structured data from Wikipedia

softwaremill / quicklens

Modify deeply nested case class fields

plokhotnyuk / jsoniter-scala

Scala macros for compile-time generation of safe and ultra-fast JSON codecs + circe booster

build-server-protocol / build-server-protocol

Protocol for IDEs and build tools to communicate about compile, run, test, debug and more.

microsoft / SynapseML

Simple and Distributed Machine Learning Python Library porting ML algorithms for Spark

JohnSnowLabs / spark-nlp

State of the Art Natural Language Processing

circe / circe

Yet another JSON library for Scala

metarank / metarank

A low code Machine Learning personalized ranking service for articles, listings, search results, recommendations that boosts user engagement. A friendly Learn-to-Rank engine

OpenBankProject / OBP-API

An open source RESTful API platform for banks that supports Open Banking, XS2A, PSD2 and Open Finance through access to accounts, transactions, counterparties, payments, entitlements and metadata - plus a host of internal banking and management APIs.

OSCPU / NutShell

RISC-V SoC designed by students in UCAS

combust / mleap

MLeap: Deploy ML Pipelines to Production

json4s / json4s

JSON library

softwaremill / tapir

Rapid development of self-documenting APIs

akka / akka-http

The Streaming-first HTTP server/module of Akka

softwaremill / macwire

Zero-cost, compile-time, type-safe dependency injection library.

lensesio / stream-reactor

A collection of Kafka Connect sinks and sources maintained by Lenses.io.

apache / livy

Apache Livy is an open source REST interface for interacting with Apache Spark from anywhere.

zio / zio-http

A next-generation Scala framework for building scalable, correct, and efficient HTTP clients and servers

softwaremill / magnolia

Easy, fast, transparent generic derivation of typeclass instances

etorreborre / specs2

Software Specifications for Scala

unfiltered / unfiltered

A toolkit for servicing HTTP requests in Scala

jwt-scala / jwt-scala

JWT support for Scala. Bonus extensions for Play, Play JSON, Json4s, Circe, uPickle, Spray and Argonaut

AbsaOSS / spline

Data Lineage Tracking And Visualization Solution

wvlet / airframe

Essential Building Blocks for Scala

argonaut-io / argonaut

Purely functional JSON parser and library in scala.

softwaremill / ox

Safe direct-style streaming, concurrency and resiliency for Scala on the JVM

FasterXML / jackson-module-scala

Add-on module for Jackson (https://github.com/FasterXML/jackson) to support Scala-specific datatypes

YeXiHuTeam / YeXiHuCore

USTC YeXiHu Team NSCSCC 2026 LA32R out-of-order processor core in Chisel. 中国科学技术大学也西湖队龙芯杯参赛项目。

SuperscalarCrash / Gemmont

(NSCSCC 2026) A high-performance out-of-order superscalar LA32R processor for AI Agents

softwaremill / elasticmq

In-memory message queue with an Amazon SQS-compatible interface. Runs stand-alone or embedded.

gvolpe / trading

💱 Trading application written in Scala 3 that showcases an Event-Driven Architecture (EDA) and Functional Programming (FP)

elipsitz / gamebub

Open-source FPGA retro emulation handheld