Open Source

2026-02-08 — LibraStudio Dev Log #1 Background Why Another .NET IDE? The IDE options in the .NET ecosystem are actually quite limited. Visual Studio is powerful but Windows-only, and even the Community Edition has restrictions on commercial use. The VS Code + C# Dev Kit combo is great, but the fact that C# Dev Kit is proprietary doesn’t change. Ultimately, vendor lock-in occurs at critical points, and the entire tool chain and workflow built on top becomes dependent on a specific vendor’s decisions. ...

Open Source Contribution in the AI Era: Lessons from the HwpLibSharp Porting Project I’ve been a Microsoft MVP for 17 years now. One of the most frequently asked questions I’ve received in the .NET community is “How do I work with HWP files in C#?” The official library from Hancom was built on Windows and COM, leaving virtually no solution for cross-platform .NET environments. Then I discovered hwplib by @neolord0—a pure Java open source library that parses the HWP file format. The thought immediately struck me: “Porting this to .NET would be a real contribution to the community.” But it wasn’t going to be easy. The codebase was massive, and it was still being actively updated. ...

It Started with Simple Curiosity “I wish I could handle HWP files directly in .NET…” I’m probably not the only .NET developer who has had this thought. HWP files are still widely used in Korea, especially in government agencies, but the .NET ecosystem lacked a proper open-source library to handle them. Previously, the only way to work with HWP files in .NET was to use the HWP ActiveX control’s COM type library that comes with Hangul (the word processor), limited to Windows. Unfortunately, even this support has been discontinued, leaving us with no options. ...

Introduction If you’ve ever used internet banking in Korea, you’ll be familiar with the numerous security program installation requirements. While ActiveX has disappeared, countless security plugins that replaced it—AhnLab Safe Transaction, TouchEn nxKey, Veraport, and more—still demand installation on our PCs. The TableCloth project is an open-source tool that allows you to run these security programs in an isolated Windows Sandbox environment. The TableCloth Catalog serves as a database that organizes which security programs are required for each financial website. ...

What is the TableCloth Project? TableCloth is an open-source project that helps users safely use security plugins required for Korean internet banking in a Windows Sandbox environment. It runs security programs required by various financial institution websites in an isolated environment, ensuring the safety of the host system. What is the Catalog Repository? The TableClothCatalog repository stores the list of security programs required for each financial institution site referenced by the TableCloth project. Security plugin information required by websites of banks, securities firms, and insurance companies is systematically organized here. The catalog builder tool processes this information into a format usable by the TableCloth app. ...