Swift is a general-purpose programming language developed by Apple Inc. for iOS, OS X, watchOS and tvOS. Currently, it is the most popular open-source programming language on Github.

Open source projects can be useful for beginners to read the source code and advanced programmers to work on top of the existing projects. This list is competitive and carefully includes the best iOS projects that can help you code more productively in Swift.

No.1

[Official] Firefox iOS app built in Swift (Github Stars: 5,906).

No.2

[Official] WordPress for iOS written in Swift (Github Stars: 1,225).

No.3

[Official] Artsy: Auction App for Arts written in Swift (Github Stars: 1,302) Courtesy of Artsy

No.4

Designer News App Built in Swift (Github Stars: 1,760). Courtesy of Meng To

No.5

Flappy iOS App in Swift (Github Stars: 7,854).

No.6

[Official] Wire iPhone and iPad app built in Swift (Github Stars: 1,239).

No.7

[Official] Turn On your VPN like a hero. Open source app built in Swift (Github Stars: 2,523).

No.8

Yep: A community where geniuses meet, written in Swift (Github Stars: 4,547).

No.9

WeChat clone written in Swift (Github Stars: 1,219).

No.10

2048 for Swift (Github Stars: 2,212).

No.11

AudioKit: Open-source audio synthesis, processing, & analysis platform built in Swift (Github Stars: 2,219).

No.12

A Hacker News reader in Swift (Github Stars: 1,127).

No.13

Furni for iOS: a furniture store app written in Swift 2 by Twitter dev team. (Github Stars: 997).

No.14

Dunk: Dribbble client in Swift (Github Stars: 486).

No.15

Charter: An open source Swift mailing list app for iPhone and iPad (Github Stars: 255).

Good Luck!