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Top 17 Java Hacktoberfest2021 Projects
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Teku - Java implementation
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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InterviewQuestions2021
You can contribute to this repo by adding Coding Questions with Solutions in any programming language
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Code-Contribution
Make your first PR! ~A beginner friendly repository made specifically for open source beginners. Add any program under any language (it can be anything from a hello-world program to a complex data structure algorithm) or update the existing one. Just make sure you add the program under the correct language directory. Happy coding
Enhancement-3 I found a repository named code-contribution that contains many problems similar to those we solve on LeetCode and HackerRank. It reminded me of the problems I recently solved on HackerRank, so I decided to contribute one of them to the repository. It was great way to refresh my knowledge, and I was able to solve it even better this time before.
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awesome-spring-boot-rest-api
:sunny: :star: :star: Awesome Spring Boot REST API :star: :star: :sunny:
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Making-class-in-different-Programming-languages-
Making Class in different programming languages is an attempt to make it possible for all the classes available in one place in different languages!
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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).
Java Hacktoberfest2021 discussion
Java Hacktoberfest2021 related posts
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JDK Mission Control 7.0 Tutorial (2020)
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Join us for Hacktoberfest 2022 by contributing to StepZen
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How did I get my first job as a software engineer?
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Need help to start opensource
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Best Open Source Programs For Students to Participate
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Open Source programs
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Googling and Self-Teaching – Attend Code School Q&A with Danielle Thompson
- A note from our sponsor - SaaSHub www.saashub.com | 22 Dec 2025
Index
What are some of the best open-source Hacktoberfest2021 projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | CompreFace | 6,935 |
| 2 | cardboard | 1,122 |
| 3 | es4x | 890 |
| 4 | teku | 751 |
| 5 | jmc-tutorial | 226 |
| 6 | Java | 72 |
| 7 | ICBM-Classic | 48 |
| 8 | AI-Improvements | 46 |
| 9 | RaumBaller | 22 |
| 10 | Go-To-Sleep-Android | 14 |
| 11 | jpizza | 10 |
| 12 | InterviewQuestions2021 | 8 |
| 13 | Code-Contribution | 7 |
| 14 | awesome-spring-boot-rest-api | 5 |
| 15 | Making-class-in-different-Programming-languages- | 4 |
| 16 | DV-Hacktoberfest | 3 |
| 17 | springboot-mongodb | 1 |
Sponsored
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
getstream.io