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Top 15 C# Java Projects
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one-day-one-language
Cómo dar en un día tus primeros pasos en cada lenguaje de programación. Introducción, configuración e instalación, usos habituales, fundamentos, sintaxis y próximos pasos.
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Project mention: My new hobby: watching AI slowly drive Microsoft employees insane | news.ycombinator.com | 2025-05-21
Yes but the improvements are very gradual. It takes years for something to reach maturity. At least for the web stuff which is what I know of.
Eg:
Minimal APIs were released in 2021 but it won't be until .NET 10 that they will have validation. Amazing that validation was not a day one priority for an API. I'm not certain if even in .NET 10 Minimal APIs will have full parity of features with MVC.
Minification of static assets didn't come until .NET 9 released in 2024. This was already commonplace in the JS world a decade earlier. It could have been a quick win so long ago for .NET web apps.
Blazor was released in 2018. 7 years later they still haven't fixed plenty of circuit reconnection issues. They are working on it but progress is also quite slow. Supposedly with .NET 10 session state will be able to be persist etc but it remains to be seen.
OpenAPI is also hit and miss. Spec v3.1 released in 2021 is still not supported. Supposedly it will come with .NET 10.
Not from .NET but they have a project called Kiota for generating clients from OpenAPI specs. It's unusable because of this huge issue that makes all properties in a type nullable. It's been open since 2023. [1]
Etc.
[1] https://github.com/microsoft/kiota/issues/3911
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CDM
The Common Data Model (CDM) is a standard and extensible collection of schemas (entities, attributes, relationships) that represents business concepts and activities with well-defined semantics, to facilitate data interoperability. Examples of entities include: Account, Contact, Lead, Opportunity, Product, etc.
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Project mention: IKVM – A Java Virtual Machine and Bytecode-to-IL Converter for .NET | news.ycombinator.com | 2025-02-06
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Project mention: Archived: Popular backend frameworks by performance benchmark ranking in 2024 | dev.to | 2025-07-05
It's essential to note that this comparison primarily focuses on backend frameworks and not on programming languages. Drawing conclusions like "Rust outperforms Java" or "C# surpasses JS" may seem valid from the data, it's a false conclusion from my analysis. For a direct comparison of programming languages, there are separate benchmarks available for that purpose (like this or that).
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Alex
A Minecraft client written in C# aimed at compatibility with MC:Java & MC:Bedrock (by ConcreteMC)
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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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serverless-test-samples
This repository is designed to provide guidance for implementing comprehensive test suites for serverless applications.
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rust-zero-cost-abstractions
Testing out a Zero Cost Abstraction in Rust compared to similar approaches in C# and Java
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HeuristicsForCleanCode
The goal of the project is to help learn heuristics that will help you write clean code. Use them for the benefit of the community.
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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).
C# Java discussion
C# Java related posts
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IKVM – A Java Virtual Machine and Bytecode-to-IL Converter for .NET
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A Java JIT Compiler and Runtime in Common Lisp
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From Good to Great: Taking Your Test Coverage to the Next Level
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IKVM – A Java Virtual Machine and Bytecode-to-IL Converter for .NET
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Ask HN: How best to sync a subset of my files with a friend?
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Obsidian Git - tips on how to use it for reliable sync?
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I'm not a Java dev but I'm using it in AoC this year
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A note from our sponsor - Sevalla
sevalla.com | 1 Sep 2025
Index
What are some of the best open-source Java projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | xdm | 7,268 |
| 2 | one-day-one-language | 4,273 |
| 3 | kiota | 3,492 |
| 4 | CDM | 1,750 |
| 5 | ikvm | 1,436 |
| 6 | Programming-Language-Benchmarks | 744 |
| 7 | Alex | 595 |
| 8 | minestat | 359 |
| 9 | serverless-test-samples | 333 |
| 10 | I18N | 76 |
| 11 | rust-zero-cost-abstractions | 48 |
| 12 | JNetCall | 49 |
| 13 | java-linq-examples | 46 |
| 14 | HeuristicsForCleanCode | 19 |
| 15 | why-compiled-languages | 7 |
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