List of transpilers, sorted by target language

C/C++

Compilers targeting C

Python

List of languages that compile to Python

Project name/link	Language(s) supported
JS2Py	JavaScript
Perl2python, Pythonizer, Bridgekeeper	Perl
ti842py	TI-84 Basic
smop	Matlab, Octave
matlab-to-python-online-transpiler, matlab2python	Matlab
csharptopython	C#
gotopy	Go
infl	Ruby
ToPython	Mathematica

PHP

Project name/link	Language(s) supported
python-to-PHP	Python
js2php	JavaScript
ts2php	TypeScript
lua2php	Lua
cs2php	C#
java2php	Java
perl2php	Perl
peeble	F#

C#

Project name/link	Language(s) supported
JavaSharp, Java2CSharp	Java
Go2cs	Go
fs2cs	F#
Sharpify	JavaScript
Hebron	C
py2cs	Python

Swift

Project name/link	Language(s) supported
SharpSwift	C#
Kotlift	Kotlin
objc2swift, Swiftify	Objective-C
j2swift	Java

Kotlin

Project name/link	Language(s) supported
Gryphon	Swift
SwiftKotlin	Swift

Lua

See the main list of languages that compile to Lua.

Project name/link	Language(s) supported
PyLua	Python
Python-Lua	Python
MoonScript	Moonscript
CSharp.lua	C#
typescript2lua	TypeScript
js2lua	JavaScript
Wasynth	WebAssembly
Pas2lua	Pascal

JavaScript

List of languages that compile to JavaScript

Rust

Project name/link	Language(s) supported
Py2many	Python
Pyrs	Python
C2Rust, Corrode	C
Crust	C++
Rusby	Ruby
Rustly	Clojure
Rustre	Lustre
Corollary	Haskell
Lua2Rust	Lua

Julia

Matlab to Julia

WebAssembly

List of languages that compile to WebAssembly

C

Compilers targeting C

C++

Project name/link	Language(s) supported
go2cpp	Go

Go

Project name/link	Language(s) supported
Godzilla	JavaScript
Grumpy, Gython	Python
php2go	PHP
pas2go	Pascal
f42go	Fortran
ocaml2go	OCaml

Bash

Project name/link	Language(s) supported
BashScript	TypeScript
BashJS	JavaScript
Lua2Bash	Lua
sherlock.py	Python

Fortran

Project name/link	Language(s) supported
c2f	C
matlab2fortran	Matlab
transpyle	Python

Perl

Project name/link	Language(s) supported
f77-to-perl	Fortran
app-a2p	Awk

Haxe

Project name/link	Language(s) supported
ax3, as2hx	AS3
Cs2hx, Phase	C#
Jaxe	Java
tardisgo	Go
node-ts2hx	TypeScript
Dragon	Python
go2hx	Go

Scala

Project name/link	Language(s) supported
CsScala	C#
java2scala	Java
scala-golang-converter	Go

Ruby

Project name/link	Language(s) supported
CPP2Ruby, C++ To C#/Ruby Code Converter	C++
Py2rb	Python

Java

Project name/link	Language(s) supported
py2java, p2j	Python
m2j	Modula-2
objc2java	Objective-C
CrossCompiling	C++
csharp2java, cs2j	C#
dart2java	Dart
Rubyflux	Ruby
luaj	Lua
m2j	Modula-2

GLSL

Project name/link	Language(s) supported
Circle	C++
pyosl	OSL
hlsl-into-glsl	HLSL
SharpShader	C#
JLSL	Java
SVG-to-GLSL-Converter	SVG
Cg2glsl	CG
SPIRV-CROSS	SPIR-V
https://github.com/stackgl/glsl-transpiler	JavaScript
https://github.com/SieR-VR/typesl	TypeScript

Nim

Project name/link	Language(s) supported
c2nim	C
py2nim	Python
Craxe	Haxe
ts2nim	TypeScript

TypeScript

Project name/link	Language(s) supported
java2typescript	Java
typescriptr	C#
dart2ts	Dart
lua2typescript	Lua
wax	Wax

Dart

Project name/link	Language(s) supported
ts2dart	TypeScript
py2dart	Python
objc2dart	Objective-C
java2dart	Java

Matlab

Project name/link	Language(s) supported
f2matlab	Fortran
mathematica-matlab	Wolfram Mathematica

SQL

Languages that compile to SQL

Project name/link	Language(s) supported
Grizzly	Python

Coq

Project name/link	Language(s) supported
Goose	Go

F#

Project name/link	Language(s) supported
cs2fs	C#

R

Project name/link	Language(s) supported
matconv	Matlab, Erlang

Common Lisp

Project name/link	Language(s) supported
Vacietis	C
Iota	LLVM
CL-JavaScript	JavaScript

Elixir

Project name/link	Language(s) supported
Efe	Erlang
erl2ex	Erlang