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The Scala 3 compiler is also known as Dotty. The Dotty compiler frontend has been developed since November 2012 by Martin Odersky. It is expected and hoped for that the list of contributors to the codebase will grow quickly. Dotty draws inspiration and code from the original Scala 2 compiler "nsc", which is still developed at scala/scala [1].

The majority of the Dotty codebase is new code, with the exception of the components mentioned below. We have for each component tried to come up with a list of the original authors in the scala/scala [1] codebase. Apologies if some major authors were omitted by oversight.

dotty.tools.dotc.ast: The syntax tree handling is mostly new, but some elements, such as the idea of tree copiers and the TreeInfo module, were adopted from scala/scala [1]. The original authors of these parts include Martin Odersky, Paul Phillips, Adriaan Moors, and Matthias Zenger.
dotty.tools.dotc.classpath: The classpath handling is taken mostly as is from scala/scala [1]. The original authors were Grzegorz Kossakowski, Michał Pociecha, Lukas Rytz, Jason Zaugg and others.
dotty.tools.dotc.config: The configuration components were adapted and extended from scala/scala [1]. The original sources were authored by Paul Phillips with contributions from Martin Odersky, Miguel Garcia and others.
dotty.tools.dotc.core: The core data structures and operations are mostly new. Some parts (e.g. those dealing with names) were adapted from scala/scala [1]. These were originally authored by Martin Odersky, Adriaan Moors, Jason Zaugg, Paul Phillips, Eugene Burmako and others.
dotty.tools.dotc.core.pickling: The classfile readers were adapted from the current Scala compiler. Original authors were Martin Odersky, Iulian Dragos, Matthias Zenger and others.
dotty.tools.dotc.parsing: The lexical and syntactic analysis components were adapted from the current Scala compiler. They were originally authored by Martin Odersky, Burak Emir, Paul Phillips, Lex Spoon, Sean McDirmid and others.
dotty.tools.dotc.profile: The per-phase profiling support is taken mostly as is from scala/scala. The original author was Mike Skells.
dotty.tools.dotc.reporting: Adapted from scala/scala [1] with some heavy modifications. They were originally authored by Matthias Zenger, Martin Odersky, and others.
dotty.tools.dotc.typer: This is new code except for some minor components (e.g. the ConstantFolder). It uses however many solution details that have been developed over time by many people, including Jason Zaugg, Adriaan Moors, Lukas Rytz, Paul Phillips, Grzegorz Kossakowski, and others.
dotty.tools.dotc.util: The utilities package is a mix of new and adapted components. The files in scala/scala [1] were originally authored by many people, including Paul Phillips, Martin Odersky, Sean McDirmid, and others.
dotty.tools.io: The I/O support library was adapted from current Scala compiler. Original authors were Paul Phillips and others.
dotty.test.DottyBytecodeTest: Is an adaptation of the bytecode testing from scala/scala [1]. It has been reworked to fit the needs of dotty. Original authors include: Adrian Moors, Lukas Rytz, Grzegorz Kossakowski, Paul Phillips.
dotty.tools.dotc.sbt and everything in sbt-bridge: The sbt compiler phases are based on [2] which attempts to integrate the sbt phases into scalac and is itself based on the compiler bridge in sbt 0.13 [3], but has been heavily adapted and refactored. Original authors were Mark Harrah, Grzegorz Kossakowski, Martin Duhemm, Adriaan Moors and others.
dotty.tools.dotc.plugins: Adapted from scala/scala [1] with some modifications. They were originally authored by Lex Spoon, Som Snytt, Adriaan Moors, Paul Phillips and others.
dotty.tools.scaladoc: The Scaladoc documentation utility ships some third-party JavaScript and CSS libraries which are located under scaladoc/resources/dotty_res/styles/, scaladoc/resources/dotty_res/scripts/, docs/css/ and docs/js/. Please refer to the license header of the concerned files for details.
dotty.tools.dotc.coverage: Coverage instrumentation utilities have been adapted from the scoverage plugin for scala 2 [4], which is under the Apache 2.0 license.
dooty.tools.pc: Presentation compiler implementation adapted from scalameta/metals [5] mtags module, which is under the Apache 2.0 license.
The Dotty codebase contains parts which are derived from the ScalaPB protobuf library [6], which is under the Apache 2.0 license.

[1] https://github.com/scala/scala [2] https://github.com/adriaanm/scala/tree/sbt-api-consolidate/src/compiler/scala/tools/sbt [3] https://github.com/sbt/sbt/tree/0.13/compile/interface/src/main/scala/xsbt [4] https://github.com/scoverage/scalac-scoverage-plugin [5] https://github.com/scalameta/metals [6] https://github.com/scala/scala3/pull/5783/files

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