Lean's LEDE

RouteLLM is an open-source framework from lm-sys for serving and evaluating routers that direct requests between stronger and cheaper language models. It provides trained routers, a drop-in replacement for the OpenAI client, and an OpenAI-compatible server; routing decisions use configurable cost thresholds that can be calibrated for a target share of requests sent to the stronger model. The framework supports comparing routers across benchmarks and extending it with additional routers, model pairs, and providers.

ESP32 Bit Pirate is open-source ESP32-S3 firmware that turns supported development boards into multi-protocol hardware development and analysis tools, inspired by the Bus Pirate. It provides a command-line interface over USB serial or Wi-Fi web serial for sniffing, sending, testing, and scripting wired protocols such as I2C, SPI, UART, 1-Wire, CAN, GPIO, JTAG, and USB, as well as wireless technologies including Bluetooth, Wi-Fi, Sub-GHz, RFID, infrared, LoRa, and FM. The firmware includes protocol-specific tools such as EEPROM and flash access, UART bridges, device scanning, signal recording and replay, radio analysis, PWM and direct I/O control, and Bus Pirate-style bytecode or Python scripting. The project supports several ESP32-S3-based boards, including ESP32-S3 Dev Kits, M5Stack devices, and LILYGO boards, and provides web tools, hardware guides, recipes, and documentation through its project website.

Lean 4 is a programming language and theorem prover used to formalize mathematical proofs, including proofs generated by AI systems. Its project repository provides the language implementation along with theorem-proving and functional-programming tutorials, reference documentation, examples, installation guidance, and instructions for building from source.

An OpenAI repository containing Lean 4 formalizations of ten results presented in its paper on advances in mathematics and theoretical computer science. The formalizations cover high-dimensional sphere packing; binary and spherical codes; non-sofic groups; Connes’s rigidity conjecture; arithmetic circuit complexity; quantum parallel repetition; the closest vector problem; Ehrhart’s volume conjecture; multicolor Ramsey numbers; and compactness and degeneracy conjectures in extremal graph theory. Each result is implemented as a separate Lean module, including `SpherePacking.lean`, `MetricCodes.lean`, `NonSoficGroup.lean`, `ConnesRigidity.lean`, `Permanent.lean`, `QuantumParallelRepetition.lean`, `GapCVP.lean`, `EhrhartVolumeInequality.lean`, `MulticolorTriangleRamsey.lean`, and `CompactnessAndDegeneracy.lean`. The project uses Lean 4.32.0, mathlib, and Lake. With the mathlib cache installed, all formalizations can be built with `lake build All`, or individual modules can be built by name; the repository also provides reasoning walkthroughs and documents independent checking with Comparator.

retrobios is an open-source tool for building and installing source-verified BIOS and firmware packs for emulation platforms including RetroArch, Batocera, Recalbox, Lakka, RetroPie, EmuDeck, RetroBat, RetroDECK, RomM, BizHawk, ROCKNIX, and MiSTer FPGA. It reads emulator source code to identify files loaded by each emulator, cross-references those requirements with platform BIOS lists, records file hashes and expected sizes where available, identifies gaps, and generates platform-, emulator-, system-, or region-specific packs. Its installer detects the target platform, downloads missing files, places them in the platform's expected directory, and verifies checksums; Python scripts can also generate packs and validate existing collections. The repository includes a documentation site and JSON, CSV, and SQLite metadata exports. The scripts and tooling are MIT-licensed, while the BIOS and firmware files are third-party system software distributed for personal backup, archival, and emulation interoperability.