Top 12 Open-Source Alternatives to CSS

The top open-source alternatives to CSS are Python, PHP, and Sass. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Python Landing Page
1

Python

Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Pricing:
- Open Source
#Programming Language #OOP #Generic Programming Language 280 social mentions
PHP Landing Page
2

PHP

A popular general-purpose scripting language that is especially suited to web development
Pricing:
- Open Source
#Programming Language #OOP #Generic Programming Language 53 social mentions
Sass Landing Page
3

Sass

Syntatically Awesome Style Sheets
Pricing:
- Open Source
#Developer Tools #Design Tools #Javascript UI Libraries 131 social mentions
Tailwind CSS Landing Page
4

Tailwind CSS

A utility-first CSS framework for rapidly building custom user interfaces.
Pricing:
- Open Source
#Developer Tools #Design Tools #Website Design 867 social mentions
Bootstrap Landing Page
5

Bootstrap

Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 326 social mentions
Scala Lang Landing Page
6

Scala Lang

Scala is a pure-bred object-oriented language that runs on the JVM
Pricing:
- Open Source
#Programming Language #JVM Programming Language #OOP 5 social mentions
Material UI Landing Page
7

Material UI

A CSS Framework and a Set of React Components that Implement Google's Material Design
Pricing:
- Open Source
#Design Tools #Development Tools #Developer Tools 75 social mentions
Pug Landing Page
8

Pug

Pug is a robust, elegant, feature rich template engine for Node.js
Pricing:
- Open Source
#Development #Javascript UI Libraries #Tool 20 social mentions
Bulma Landing Page
9

Bulma

Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 109 social mentions
Ruby Landing Page
10

Ruby

A dynamic, interpreted, open source programming language with a focus on simplicity and productivity
Pricing:
- Open Source
#Programming Language #OOP #Dynamic Programming Language 3 social mentions
UIKit Landing Page
11

UIKit

A lightweight and modular front-end framework for developing fast and powerful web interfaces
Pricing:
- Open Source
#CSS Framework #Development Tools #Design Tools 20 social mentions
Go.CD Landing Page
12

Go.CD

Open source continuous delivery tool allows for advanced workflow modeling and dependencies management.
Pricing:
- Open Source
#Continuous Integration #DevOps Tools #Programming Language