# fusionlanguage/fut

Fusion programming language. Transpiling to C, C++, C#, D, Java, JavaScript, Python, Swift, TypeScript and OpenCL C.

Repository: https://github.com/fusionlanguage/fut
Canonical: https://ross.abutalabs.com/products/fut
Homepage: https://fusion-lang.org
Language: C++
License: GPL-3.0
License Family: copyleft
Topics: programming-language, language, transpiler
Last push: 2026-08-18T10:51:21+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 2509, "days_push": 15, "days_rel": 15, "gap_med": 35, "n_releases_24m": 16}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1928, forks 71 (observed 2026-08-28T04:05:55.808127+00:00)

## What it is
Fusion is a programming language designed for writing reusable library components in a single codebase that transpiles to C, C++, C#, D, Java, JavaScript, Python, Swift, TypeScript, and OpenCL C. The compiler, written in C++, generates lightweight, human-readable code that follows each target language's conventions with no runtime dependencies.

## Use cases
- write a library once and compile it to multiple languages
- transpile a single codebase to C, C++, Java, Python, and JavaScript
- share reusable components across different programming languages
- generate idiomatic code for each target language from one source
- compile Fusion code to OpenCL C for GPU kernels
- avoid maintaining parallel implementations of the same library in many languages

## When to choose
- you maintain a library that must be available in many languages
- you want a single source of truth for cross-language components
- you need dependency-free, human-readable generated code
- you want to target OpenCL C for GPU computing from one codebase

## When to avoid
- you need a language with a large ecosystem and community
- your project targets only one language
- you need runtime features like garbage collection or a VM
- you require extensive third-party package support

## Facets
- artifact type: cli-tool
- maturity: active
- function: compiler, programming-language, cli, developer-tools
- domain: programming-languages, compilers, developer-tools, cross-platform
- platform: cross-platform, cli, cpp
- tags: transpiler, multi-target-code-generation, single-source, source-to-source, programming-language

## Member repositories
- fusionlanguage/fut (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:55.808127+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:32:13.031106+00:00, confidence not recorded.
  - readme: https://github.com/fusionlanguage/fut (fetched 2026-08-28T04:05:55.808127+00:00, sha d11fd1931436)
  - homepage: https://fusion-lang.org (fetched 2026-08-29T10:48:32.007155+00:00, sha d397e4bc7854)
- Data as of 2026-08-30T08:39:29.467469+00:00.