What are the best web apps for open source?

People on Linkstore rate Flowise, Lucide and Phosphor highly. Every app on this list was opened and checked by a person before it went live.

Are there free apps for open source?

Yes. Flowise, Lucide, Phosphor and Appwrite and 9 more are free to use or have a free plan. Lucide and Phosphor are completely free.

Do web apps for open source need to be installed?

No. They all run in a web browser, so you can open one and start right away. Phosphor, Keyline Icons and macOS Icons can also be installed to a home screen or dock if you like.

How is this list ordered?

By rating: a weighted average of the ratings people leave on Linkstore, so a few early five-star ratings can't outrank a large, steady score. Nobody can pay to move up.

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13 best web apps for open source in 2026

The best web apps for open source, ranked by what people rate them. All of them run in your browser. Flowise, Lucide and Phosphor lead the list. 13 of them are free or have a free plan.

13 apps · 13 free or with a free plan · Updated October 2026

13 apps for open source

Best rated first. Paid placements never change this order.

1
Flowise
Drag-and-drop builder for LLM workflows.
AINewFreemium
Open
2
Lucide
A clean open-source icon set, forked from Feather.
DesignNewFree
Open
3
Phosphor
A flexible icon family with weights from thin to fill.
DesignNewFree
Open
4
Appwrite
An open-source backend: auth, database and storage.
Developer ToolsNewFreemium
Open
5
Keyline Icons
A free 24px icon set on one grid, in stroke, duotone and fill.
DesignNewFree
Open
6
Fancy Components
Playful React components to make a site feel less flat.
DesignNewFree
Open
7
macOS Icons
Thousands of replacement icons for Mac apps and folders.
DesignNewFree
Open
8
Iconoir
A large open-source icon set. No account, no paid tier.
DesignNewFree
Open
9
HyperUI
Free Tailwind components you can copy into a page.
DesignNewFree
Open
10
shadcn/ui
Copy-paste React components you own in your repo.
DesignNewFree
Open
11
Open Doodles
Sketchy illustrations you can recolor and download.
DesignNewFree
Open
12
Wallpaperz
Free, open-source wallpapers for phone, laptop and desktop, hand-picked for taste, plus an AI studio to make your own. No watermarks, no popups.
DesignNewFreemium
Open
13
Mastodon
Decentralized social networking with no ads.
SocialNewFree
Open