Open Source Kotlin Build Tools

v2flyNG is a mobile client that packages the V2Ray/V2Fly networking core into an Android application with a touch-friendly UI. It focuses on making modern protocols—such as VMess, VLESS, and Trojan—accessible without requiring shell access or manual config editing. Profiles can be added via subscription links or QR codes, and the app merges and updates them on schedule to keep node lists fresh. Per-app proxy controls allow you to include or exclude specific applications, which is useful for balancing privacy with bandwidth and latency. The client exposes routing controls, TLS settings, custom DNS, and UDP handling so advanced users can fine-tune behavior. Status panels and logs help diagnose connectivity issues and confirm that rules are being applied as intended.

Anko is a Kotlin library which makes Android application development faster and easier. It makes your code clean and easy to read, and lets you forget about rough edges of the Android SDK for Java. Anko was born as a type-safe DSL for building Android layouts. It not only allowed creating layouts in a type-safe way, but it made the layouts more adaptable, dynamic, reusable, and also performant, as there was no need for expensive layout inflation. Anko consists of several parts that make up the complete framework, which are: Anko Commons: a lightweight library full of helpers for intents, dialogs, logging and so on. Anko Layouts: a fast and type-safe way to write dynamic Android layouts. Anko SQLite: a query DSL and parser collection for Android SQLite. Anko Coroutines: utilities based on the kotlinx.coroutines library.

Amper is an open-source data collection and metric reporting agent developed by JetBrains as part of their internal analytics and telemetry infrastructure for IntelliJ-based products. Its purpose is to gather usage statistics, performance metrics, error reports, and other diagnostic signals from IDE installations in a privacy-conscious way to help product teams understand real-world usage patterns and improve quality. Designed to be lightweight and efficient, Amper runs as a background service that batches and securely transmits anonymous data back to analytics pipelines while respecting user privacy settings and opt-outs. The architecture focuses on extensibility so that developers can define new metric types, customize triggers, and enrich events with context without adding overhead to the IDE. Data collected by Amper feeds dashboards and experimentation systems that guide design decisions, prioritize feature improvements, and monitor the impact of releases over time.

Williamchart is an Android Library to rapidly implement attractive and insightful charts in android applications. WilliamChart v3 has been completely re-written from scratch in Kotlin and does not guarantee any API/features compatibility with previous versions. Android development has been evolving quickly, and much has changed since I first started developing williamchart (e.g patterns, testing, tools), so I decided it was time to rewrite it with all these new tools in mind. I intend to keep it as light and modular as possible.