Personal website

Keresztes Zsolt

Software Developer | Engineer | Content Creator

I work as a software developer, have an engineering background, and create content about STEM, self-development, science, and technology. This site collects my digital products, public projects, professional content, and important links.

Ways to Support

4: languages
2: products
6: public projects
Content: videos and posts
11: public links
GitHub: open source

Products

Free tools

My currently available, published and 100% free digital products in one place.

Browser extension
Pinus Maximus
A local-first new tab workspace for organizing links into screens, groups, and folders with configurable search, icons, and backgrounds.
Product site (opens in a new tab)
Chrome extension
Focus Guard
A focus helper that blocks distracting websites with a deliberate message so it is easier to return to intentional work.
Chrome Web Store (opens in a new tab)

Content

Content and videos

I create content about self-improvement, software development, science and technology, and I also talk about topics related to my published software.

Playlists

YouTube & TikTok playlists

Video content

Posts

Others

Projects

Public GitHub projects

Selected public repositories from my GitHub profile, presented in a concise product-style overview.

All projects

Chrome extension
Focus Guard
A focus helper that blocks distracting websites with a deliberate message so it is easier to return to intentional work.
GitHub repository (opens in a new tab)Chrome Web Store (opens in a new tab)
Puzzle generator
CrownGrid
CrownGrid is a Vue 3 and TypeScript web app for generating, solving, and playing Queens-style logic puzzles, with configurable boards and documented puzzle algorithms.
GitHub repo (opens in a new tab)Try it (opens in a new tab)
Local AI chat
Local Nook
Local Nook is a local-first Angular client for Ollama with streaming chat, model switching, system prompts, rich Markdown rendering, rebrandable configuration, and an AI-native Codex workflow. Built for private, maintainable local LLM use with official Ollama SDK integration.
GitHub repo (opens in a new tab)
Local RAG
Cite Nook AI
Cite Nook AI is a minimal local-first RAG application built with React, FastAPI, Ollama, PostgreSQL/pgvector, and Docker. Upload persistent documents, track indexing status, choose chat and embedding models, and ask grounded questions with source citations.
GitHub repo (opens in a new tab)
Planning poker
planning-poker
A Planning Poker example built with React, MUI, Express.js, and Socket.IO for real-time team estimation flows.
GitHub repo (opens in a new tab)
Minesweeper
ClearField
A mobile-friendly Minesweeper game built with HTML, CSS, and JavaScript, with configurable board sizes and touch controls.
GitHub repo (opens in a new tab)Try it (opens in a new tab)