FlatBuffers

Protocol Buffers (Protobuf) is Google's language-neutral, platform-neutral format and interface definition system for serializing structured data across programming languages. Developers define messages and service interfaces in `.proto` files; the `protoc` compiler generates language-specific code, which works with a Protobuf runtime for serialization and deserialization. The project is distributed as a C++ protocol compiler and language-specific runtimes, with prebuilt compiler binaries available for released versions.

Cap'n Proto is a binary data interchange format, interface definition language, and capability-based RPC system developed around core tools and a C++ library. Its generated code lets programs in multiple languages read a shared memory layout without an additional serialization step, and it provides RPC capabilities for communicating between components. The project describes itself as a binary alternative to JSON and as a faster alternative to Protocol Buffers; the repository contains the development branch and warns that it may include breaking API changes.

Syncular is an offline-first SQL synchronization toolkit that keeps an SQLite database on each client while treating a server-owned commit log as authoritative. Applications read and write local SQLite immediately; writes enter an outbox and are checked and reconciled by the server during synchronization. The browser client runs SQLite on OPFS, while native integrations share a Rust core with native SQLite through bindings for Rust, Swift, Kotlin, Flutter, React Native, and Tauri. Servers can run on Bun, Node, or Cloudflare Workers with SQLite, Postgres, or D1. The project also provides server-side persistent SyncClients, database-less SyncRemoteClients, schema and query code generation, React hooks, column encryption, Yjs CRDT integration, and TypeScript and Rust implementations checked against a shared conformance catalog. Syncular is maintained by Benjamin Kniffler and is pre-1.0; its public APIs and protocol details may change before 1.0. The repository is released under the license stated in its repository files.

Flutter is Google's open-source SDK for building mobile, web, and desktop applications from a single Dart codebase. It provides a layered UI framework with reusable widgets, including platform-oriented Cupertino and Material components, and supports custom visual components. Stateful hot reload lets developers view code changes without restarting the application or losing its state. Dart code can compile to native ARM machine code for mobile, JavaScript or WebAssembly for the web, and Intel x64 or ARM targets for desktop platforms including Windows, macOS, and Linux. Flutter is free and open source and supports integration with native code through FFI and platform-specific APIs.

Glyd is a Rust lossless-compression library and command-line tool with a C ABI, streaming interfaces, and Python and Go bindings. It targets object storage, data lakes, logs, telemetry, backups, versioned exports, RPC payloads, and caches as an alternative to LZ4, Snappy, and zstd. Its record mode detects delimited records, SQL dumps, JSON lines, and varying-shape logs, converts fields or template variables into typed streams, and compresses them in parallel. Base mode compresses a new version against an older version by using regions of the old data as history. The format uses independently decodable blocks and parallel paths; higher levels use separated token, offset, length, and literal streams with SIMD-oriented decoding, while long-distance matching can find repeated content up to 128 MB back. The repository also provides shape dictionaries for small objects, packs for many small objects, container and JPEG handling at selected levels, and a cold context-mixing level for infrequently read data. The separate glyd-store crate and CLI select similar stored objects as delta bases using fingerprints, cap delta chains, and support local directories and S3-compatible backends. The codec, CLI, C ABI, and bindings use the BSD 3-Clause License or GPL-2.0; glyd-store uses the Business Source License 1.1, with commercial production use requiring a license and conversion to Apache-2.0 four years after each release.