1：Firefox iOS

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

2：WordPress for iOS

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

3：Artsy

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

4：Designer News App

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

5：Flappy iOS

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

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6：Wire

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

7：VPN On

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

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8：Yep

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

9：仿微信

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

10：2048

2048 for Swift (Github Stars: 2,212).

11：AudioKit

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

12：Hacker News

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

13：Furni for iOS

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

14：Dunk

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

15：Charter

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

16：Swift Radio

Swift Radio: An open source radio station app with robust and professional features (Github Stars: 1,313).

17：CVCalendar

A custom visual calendar written in Swift (Github Stars: 1,920).

18：PixPic

PixPic: A Photo Editing App Built in Swift (Github Stars: 329).

19：Gulps

Gulps: Open source Swift app for iOS and Apple Watch for tracking daily water consumption (Github Stars: 613).

20：Youtube

Youtube iOS app clone written in swift 3 (Github Stars: 372).

21：SoundCloud

SoundCloud client written on Swift (Github Stars: 168).