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Top 23 Kotlin HacktoberFest Projects
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MaterialDrawer
The flexible, easy to use, all in one drawer library for your Android project. Now brand new with material 2 design.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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Kategory
The perfect companion for your Kotlin journey - Inspired by functional, data-oriented and concurrent programming (by arrow-kt)
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Use MockK library. It's an open-source and excellent library for testing. Okay, it's for testing... But why can't we use it for debugging and preview? - Of course, we can!
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Project mention: Neo Store: The modern and feature-rich F-Droid client for everyone | news.ycombinator.com | 2026-03-23
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Kotest
Powerful, elegant and flexible test framework for Kotlin with assertions, property testing and data driven tests.
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shadow
Gradle plugin for creating fat/uber JARs, transforming files, relocating packages, and optimizing with R8/ProGuard. The Gradle counterpart to Maven Shade Plugin.
Project mention: Is the Java ecosystem cursed? A dependency analysis perspective | dev.to | 2025-11-24Shadow is a powerful tool for creating "uber" or "fat" jars, which are jars that contain all their external dependencies rather than relying on a classpath. This can simplify deployments of applications since deployers only need to worry about a single jar instead of dozens, hundreds, or thousands of jars. This is fine. It becomes cursed when libraries make use of this tool, resulting in broken classpaths that contain duplicate class files such that runtime behavior is dependent on the classpath's order. I would like to point the maintainers of these libraries at Shadow's powerful relocation abilities, which enable it to change the package of bundled classes such that there can be no duplicate class problem.
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FastAdapter
The bullet proof, fast and easy to use adapter library, which minimizes developing time to a fraction...
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With Titanium Backup unmaintained, Neo Backup [1] works pretty well. It has some potential issues with restoring wifi/bluetooth/sms as those were still experimental, last I used it. But sms at least worked. I'd suggest a 2nd backup app of those, just in case.
[1] https://github.com/NeoApplications/Neo-Backup
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Jetpack-Compose-Playground
Community-driven collection of Jetpack Compose example code and tutorials :rocket: https://foso.github.io/compose
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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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AI Agent Failure Modes: 14-Type Taxonomy 2026
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Pact is great. It's also why most teams don't do contract testing
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A note from our sponsor - AppSignal
www.appsignal.com | 6 Oct 2026
Index
What are some of the best open-source HacktoberFest projects in Kotlin? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | MaterialDrawer | 11,642 |
| 2 | awesome-kotlin | 11,383 |
| 3 | AppIntro | 10,567 |
| 4 | chains | 9,828 |
| 5 | detekt | 7,080 |
| 6 | Kategory | 6,582 |
| 7 | mockk | 5,759 |
| 8 | android | 5,611 |
| 9 | tachiyomiJ2K | 5,395 |
| 10 | RetroMusicPlayer | 5,334 |
| 11 | Neo-Store | 5,323 |
| 12 | Android | 4,840 |
| 13 | Kotest | 4,789 |
| 14 | chucker | 4,570 |
| 15 | intellij-rust | 4,528 |
| 16 | Lemuroid | 4,371 |
| 17 | shadow | 4,240 |
| 18 | TachiyomiSY | 4,165 |
| 19 | android | 3,944 |
| 20 | FastAdapter | 3,879 |
| 21 | Neo-Backup | 3,840 |
| 22 | element-android | 3,729 |
| 23 | Jetpack-Compose-Playground | 3,656 |
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