CSS Themes

Open-source CSS projects categorized as Themes

Top 19 CSS Theme Projects

  1. BetterDiscordAddons

    A series of plugins and themes for BetterDiscord.

  2. Nutrient

    Nutrient – The #1 PDF SDK Library, trusted by 10K+ developers. Other PDF SDKs promise a lot - then break. Laggy scrolling, poor mobile UX, tons of bugs, and lack of support cost you endless frustrations. Nutrient’s SDK handles billion-page workloads - so you don’t have to debug PDFs. Used by ~1 billion end users in more than 150 different countries.

    Nutrient logo
  3. themes

    Free WordPress themes made by Automattic for WordPress.org and WordPress.com. (by Automattic)

  4. nextjs-admin-template

    Free admin dashboard template based on Next.Js with @paljs/ui component package

  5. kube

    Kube is a professional and a responsive Hugo theme for developers and designers that offers a documentation section mixed with a landing page and a blog. (by jeblister)

  6. gatsby-admin-template

    Free admin dashboard template based on Gatsby with @paljs/ui component package

  7. typora-github-night-theme

    Dark Typora themes that reproduce the new GitHub Dark Themes as much as possible.

  8. Flashcord

    [DESKTOP VISUAL REFRESH COMPATIBLE] The world's most advanced, complex and feature rich Discord Theme to ever exist. A complete yet user-friendly visual overhaul for Discord with many QoL features and virtually endless customization options.

  9. CodeRabbit

    CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.

    CodeRabbit logo
  10. markdown-css

    A tool convert css style into markdown inline style (by wecatch)

  11. roam-css-system

    Roam CSS System 2.0

  12. dots

    my dotfiles (by 7KIR7)

  13. Blackberry-Themes

    CSS changes to many popular web services. Improves desktop site aesthetics and creates functional mobile sites! Comes with custom icons for Organizr!

  14. old-discord-font

    CSS to revert Discord's font change.

  15. MicaFox

    [abandoned] Firefox Windows 11 Theme

  16. NovaOS-nord-Theme

    A theme for Linux desktops.

  17. Themes

    Community themes for Prism Launcher (by PrismLauncher)

  18. logseq-craft-theme

    Craft Theme for Logseq

  19. john-doe-jekyll

    The John Doe template converted into a Jekyll theme

  20. gloation

    A badass notion theme. Name inspired by the words glass and notion

  21. Firefox-Browser-Proton-Custom

    A custom userChrome.css for Firefox 86+ (February 2021). For personal purpose only.

  22. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
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).

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CSS Themes related posts

  • Fox11 - theme with auto-color, Mica, auto-hide nav-bar support and Edge/Chrome restyle 2023

    3 projects | /r/FirefoxCSS | 26 Jul 2023
  • [Upcoming] Flashcord (Alpha), probably the most advanced and unnecessarily complicated Discord Theme to ever exist yet.

    1 project | /r/BetterDiscord | 3 Jul 2023
  • [UPCOMING] Flashcord (Alpha), probably the most advanced and unnecessarily complicated Discord Theme to ever exist yet.

    1 project | /r/discordthemes | 3 Jul 2023
  • Can you recommend a starter WP template?

    1 project | /r/Wordpress | 29 Jun 2023
  • best of css settings

    3 projects | /r/FirefoxCSS | 16 Dec 2022
  • Tab connection as old Firefox 88

    2 projects | /r/FirefoxCSS | 5 Nov 2022
  • Open page in side peek is annoying, is there anyway I could config to open it in modal full page?

    1 project | /r/Notion | 24 Jul 2022
  • A note from our sponsor - CodeRabbit
    coderabbit.ai | 14 Feb 2025
    Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR. Learn more →

Index

What are some of the best open-source Theme projects in CSS? This list will help you:

# Project Stars
1 BetterDiscordAddons 2,149
2 themes 924
3 nextjs-admin-template 453
4 kube 414
5 gatsby-admin-template 320
6 typora-github-night-theme 209
7 Flashcord 157
8 markdown-css 150
9 roam-css-system 144
10 dots 123
11 Blackberry-Themes 98
12 old-discord-font 80
13 MicaFox 73
14 NovaOS-nord-Theme 72
15 Themes 67
16 logseq-craft-theme 40
17 john-doe-jekyll 33
18 gloation 29
19 Firefox-Browser-Proton-Custom 6

Sponsored
Nutrient – The #1 PDF SDK Library, trusted by 10K+ developers
Other PDF SDKs promise a lot - then break. Laggy scrolling, poor mobile UX, tons of bugs, and lack of support cost you endless frustrations. Nutrient’s SDK handles billion-page workloads - so you don’t have to debug PDFs. Used by ~1 billion end users in more than 150 different countries.
www.nutrient.io

Did you know that CSS is
the 16th most popular programming language
based on number of references?