Browse Documentation

github.com/jbomanson/flatten_as.cr

Adds `Enumerable#flatten_as` that is like `flatten` with compile time control over what is flattened.

github.com/dukenguyenxyz/flat_tree

Map a binary tree to a vector

github.com/kdairatchi/flaw

A fast static analysis tool for finding security flaws in Crystal code.

github.com/greenhats-gmbh/flc

flare.io Credential Browser Client

github.com/jemc/crystal-flecs

Crystal wrapper for the flecs ECS library

github.com/hostari/fleet_app_client

A crystal API client to interact with the Hostari fleet.

github.com/raj/flock-cli

Command-line tool to scaffold and drive Flock game projects: `flock new` (2D/3D, with tilemap / ldtk / collision), Rails-style generators (component, entity, system, resource, plugin), and `flock dev` hot reload (watch + rebuild + restart). Pure stdlib, no deps.

github.com/raj/flock-collision

CPU collision detection + rigid-body resolution for the Flock ECS engine. 2D and 3D, box/circle-sphere/capsule shapes, full rotational dynamics. GPU acceleration lives in a separate library.

github.com/RyanScottLewis/flp-viewer

FL Studio FLP file format parser and viewer.

github.com/sol-vin/fluorite

Modern FFMPEG bindings, fluent DSL, streaming process wrapper, smart conversion presets, and interactive terminal UI (TUI) for Crystal.

github.com/azutoolkit/flux

Minimalist and Fast Acceptance Test

github.com/place-labs/flux

InfluxDB v2.x crystal-lang client / Flux query language tools

github.com/elliotize/fluxcr

A library to use flux led light bulbs written in crystal

github.com/worxbend/fluxion.cr

Turn a fresh Linux machine into your machine. One YAML file, one preview, one run. CLI or TUI. A Crystal implementation of the Fluxion workstation bootstrapper.

github.com/Andriamanitra/flwrap

A wrapper that allows you to use fancyline with any executable/command

github.com/superfly/fly.cr

Crystal HTTP middleware to handle fly.io multi-region postgres replays.

github.com/hahwul/fm.cr

Crystal bindings for Apple FoundationModels.framework (macOS 26+). On-device AI powered by Apple Intelligence.

github.com/naqvis/crystal-fnv

Crystal Implementation of Fowler–Noll–Vo hash

github.com/mamantoha/foaas_client

A Crystal client for FOAAS - a modern, RESTful, scalable solution to the common problem of telling people to fuck off

github.com/matthewmcgarvey/focus

Crystal SQL query builder