Open Source Scala Programming Languages

Scala 3 is the latest major release of the Scala language—featuring a complete compiler rewrite (Dotty), new syntax with optional braces and given/using contextual abstractions, union/intersection types, opaque types, first-class enums, and better type inference. It unifies object-oriented and functional programming paradigms into a safer, more expressive language running on the JVM with full Java interoperability.

SpinalHDL is a hardware description language (HDL) embedded in Scala. It allows designers to describe digital hardware (FPGA, ASIC) using higher-level constructs (object-oriented, functional) while generating low-level hardware description outputs (VHDL, Verilog). It seeks to be more powerful and expressive than VHDL/Verilog, reducing verbosity, without introducing performance or area overheads relative to hand-written VHDL/Verilog, and generating exactly what is asked.

Flix is a statically typed programming language combining functional, imperative, and logic paradigms, with first‑class Datalog constraints and a polymorphic effect system. Designed to run on the JVM, Flix enforces purity tracking at compile time, supports algebraic data types, tail‑call elimination, and allows entire Datalog programs as values.

Vale is a modern systems programming language with its own compiler; it aims to be fast, safe, and flexible. It is AOT-compiled to LLVM, statically typed, and uses a “generational references” technique for memory safety without garbage collection. It also plans to include region-based borrow checking for additional performance. Vale provides single ownership, no garbage collector, focusing on native speed and safety.