Top 7 syntax-sugar Open-Source Projects

continuable

3 774 2.3 C++

C++14 asynchronous allocation aware futures (supporting then, exception handling, coroutines and connections)

Project mention: SAF, a scheduler aware future/promise (in the Asio ecosystem) | reddit.com/r/cpp | 2022-12-21

cool. how does this compare to https://naios.github.io/continuable/ ?
MLStyle.jl

1 352 3.6 Julia

Julia functional programming infrastructures and metaprogramming facilities

Project mention: Does anyone really like what Mathematica achieves, but hates the syntax? | reddit.com/r/ProgrammingLanguages | 2022-05-06

It seems to have all the lovable traits you stated, except ML style patterns but there's MLStyle developing.
Appwrite

appwrite.io
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Appwrite - The Open Source Firebase alternative introduces iOS support. Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
DuctTape

0 171 0.0 Swift

📦 KeyPath dynamicMemberLookup based syntax sugar for Swift.
sspipe

0 132 0.0 Python

Simple Smart Pipe: python productivity-tool for rapid data manipulation
rails_or

0 92 0.0 Ruby

Cleaner syntax for writing OR Query in Rails 5, 6. And also add #or support to Rails 3 and 4.
LangTrans

0 24 3.6 Python

Customize programming languages
Options

0 4 0.0 Swift

Easily create OptionSets from enums in Swift.
SonarLint

www.sonarlint.org
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Clean code begins in your IDE with SonarLint. Up your coding game and discover issues early. SonarLint is a free plugin that helps you find & fix bugs and security issues from the moment you start writing code. Install from your favorite IDE marketplace today.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2022-12-21.