Here is the collaborative list of open-source apps and demos to use Apple's HealthKit, ResearchKit and CareKit. Feel free to contribute. Thanks!

Apple HealthKit

Apple HealthKit APIs

Apple's sample apps:

• Reading and Writing HealthKit Series Data(iOS 13.0+)
• Fit: Store and Retrieve HealthKit Data
• SpeedySloth: Using HealthKit to build a workout app for Apple Watch
• LoopHealth: Using health documents and Activity rings in HealthKit and HealthKitUI
• Activity Rings: Contributing to Activity Rings on Apple Watch
• SwingWatch: Using Device Motion on the Watch

Apple ResearchKit

Programming Guide

sample apps:

• SageResearch
• more

Apple CareKit

FDA Regulatory on Mobile Medical Apps

Mobile Medical Applications

Policy for Device Software Functions and Mobile Medical Applications

Examples of Device Software Functions the FDA Regulates

Connecting to Bluetooth Low Energy (BLE) Devices

1. BabyBluetooth
2. BluetoothKit
3. IOS-nRF-Toolbox_Swift
4. bluejay
5. RxBluetoothKit
6. BlueCap

Most-Porpular Health & Fitness Apps in App Store (Rankings):

Top free: https://www.similarweb.com/apps/top/apple/store-rank/us/health-and-fitness/top-free/iphone

Top paid: https://www.similarweb.com/apps/top/apple/store-rank/us/health-and-fitness/top-paid/iphone

Most-Porpular Medical Apps in App Store (Rankings):

Top free: https://www.similarweb.com/apps/top/apple/store-rank/us/medical/top-free/iphone

Top paid: https://www.similarweb.com/apps/top/apple/store-rank/us/medical/top-paid/iphone

Open-source apps

Health

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• Abby's Cycle: Menstrual cycle tracker

swift

https://github.com/jc4p/abby-healthkit
Added July 11, 2016
License: other

• Arex: Reminders for taking your medications

  swift swift2.2 carthage pistachio reactivecocoa 🔥

  https://github.com/a2/arex
  Added June 9, 2015
  License: mit

• CaseAssistant: Cases recording, study, & sharing for ophthalmologist  App Store

  swift realm 🇨🇳 🔥

  https://github.com/herrkaefer/CaseAssistant
  Added June 17, 2016
  License: mpl-2.0

  

• Depressed: Test if you are depressed  App Store

  swift

  https://github.com/DerLobi/Depressed
  Added January 13, 2016
  License: mit

  

• Glucosio: Diabetes management and research

  swift objc healthkit realm

  https://github.com/Glucosio/glucosio-ios
  Added January 13, 2018
  License: gpl-3.0

• HealthKit~Swift: Sample app

  swift healthkit

  https://github.com/Darktt/HealthKit-Swift
  Added October 27, 2015
  License: other

  

• Hidrate: Interacts with smart water bottle

  objc

  https://github.com/mjcuva/Hidrate
  Added May 3, 2016
  License: other

  

• MyWeight History: Body mass tracker with easy data input & access to history  App Store

  swift

  https://github.com/diogot/MyWeight
  Added June 12, 2017
  License: mit

  

Fitness

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• Jim: Track your gym workouts

  swift parse

  https://github.com/kylejm/Jim
  Added January 4, 2016
  License: other

• LogU: Simple logging app for strength athletes

  swift

  https://github.com/brettalcox/logU-swift
  Added April 11, 2016
  License: other

  

• RaceMe: Run tracking & ghosting

  swift parse 🔥🔥🔥

  https://github.com/enochng1/RaceMe
  Added July 20, 2016
  License: other

  

• RaceRunner: A Run-Tracking App for Runners Who Race  App Store

  swift

  https://github.com/vermont42/RaceRunner
  Added March 31, 2018
  License: mit

  

• Runner-Stats: Record running data

  iphone

  https://github.com/hukun01/Runner-Stats
  Added October 12, 2015
  License: gpl-2.0

• rTracker: A generic, customizable personal data tracker  App Store

  objc

  https://github.com/rob-miller/rTracker
  Added April 19, 2016
  License: apache-2.0

  

• Swift-Walk-Tracker: Track your walks

  swift 🔥

  https://github.com/kevinvanderlugt/Swift-Walk-Tracker
  Added June 7, 2015
  License: other

  

• Theseus: Personal analytics app

  objc 🔥🔥🔥

  https://github.com/lazerwalker/Theseus
  Added April 1, 2015
  License: gpl-2.0

  

ResearchKit

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• AlzPrevent: Clinical research platform for Alzheimer's disease  App Store

  swift

  https://github.com/BBBInc/AlzPrevent-ios
  Added August 2, 2016
  License: bsd-3-clause

  

• AsthmaHealth: Asthma study

  objc

  https://github.com/ResearchKit/AsthmaHealth
  Added April 14, 2015
  License: bsd-3-clause

  

• Colorblind: Easy test for colorblind people

  swift

  https://github.com/boostcode/ResearchKit-ColorBlind
  Added May 18, 2016
  License: other

  

• GlucoSuccess: Diabetes study

  objc

  https://github.com/ResearchKit/GlucoSuccess
  Added April 15, 2015
  License: bsd-3-clause

  

• mPower: Parkinson's disease study  App Store

  objc

  https://github.com/ResearchKit/mPower
  Added April 15, 2015
  License: bsd-3-clause

  

• MyHeartCounts: Personalized tool that can help you measure daily activity, fitness, & cardiovascular risk  App Store

  objc

  https://github.com/ResearchKit/MyHeartCounts
  Added October 27, 2015
  License: bsd-3-clause

  

• Share The Journey: Breast cancer study

  objc

  https://github.com/ResearchKit/ShareTheJourney
  Added April 15, 2015
  License: bsd-3-clause

Apple Watch

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• Cortado: Track your caffeine consumption habits  App Store

  objc 🔥

  https://github.com/lazerwalker/cortado
  Added June 25, 2015
  License: mit

  

• Gulps: Track your daily water consumption  App Store

  swift 🔥🔥🔥

  https://github.com/FancyPixel/gulps
  Added April 22, 2015
  License: mit

  

• HeartControl: Continuous heart rate measurement during workouts

  swift watchos3 🔥

  https://github.com/thomaspaulmann/HeartControl
  Added August 16, 2016
  License: other

  

• heartrate: Show streaming heart rate from the watch

  swift watchos2 🔥🔥

  https://github.com/coolioxlr/watchOS-2-heartrate
  https://imgur.com/a/xVqqj
  Added July 29, 2015
  License: other

  

• MyWeight History: Body mass tracker with easy data input & access to history  App Store

  swift

  https://github.com/diogot/MyWeight
  Added June 12, 2017
  License: mit

  

• watchOS-2-Sampler: watchOS 2 new features example code

  swift watchos2 🔥🔥🔥🔥

  https://github.com/shu223/watchOS-2-Sampler
  Added June 23, 2015
  License: mit