Find a capability
Find a capability
The ecosystem is wide enough that the real risk is not finding a library but not knowing it exists and rebuilding it. This page is the lookup: what you need, and the module that already does it.
If what you need is not here, check the family pages before starting — and if it genuinely is not in the ecosystem, it belongs in the organisation that owns the domain, not in the repository that happens to need it first.
User interface
| I need to… | Use |
|---|---|
| Build a GUI | go-widgets/toolkit |
| Open a real window on Linux, macOS or Windows | go-widgets/window |
| Draw into a terminal instead | go-widgets/tui |
| Bind state to widgets | go-widgets/mvvm + go-widgets/mvvmtk |
| Theme a UI declaratively | go-widgets/skin |
| Put an icon on a button | go-icons/iconoir for the glyph, drawn through go-gfx/gfx’s svg — never hand-draw one |
| Use a brand logo, a language mark or a file-type icon | go-icons — simple-icons, devicon, material, seti, vscode-icons |
| Highlight source code in an editor widget | go-rouge/rouge via go-widgets/toolkit/rougelex |
| Add a system-tray or menu-bar item | go-widgets/tray |
| Animate a widget | go-widgets/toolkit/anim |
| Ship an Android APK with a Go-painted UI | go-widgets/android |
Desktop integration
| I need to… | Use |
|---|---|
Read .desktop entries or find installed apps | go-freedesktop/desktopentry |
| Look up an icon by name in the icon theme | go-freedesktop/icontheme |
| Detect a file’s MIME type | go-freedesktop/mime |
| Find which app opens a type | go-freedesktop/mimeapps |
| Send a desktop notification | go-freedesktop/notifications |
| Cache a thumbnail | go-thumbnail/thumbnail |
| Store a secret in the OS keychain | go-keyring/keyring |
| Talk to D-Bus | github.com/godbus/dbus/v5 — the reference library, itself CGO-free |
| Call an Objective-C API on macOS | go-macos/objc |
| Call a Win32 or WinRT API | go-mswin/win32, go-mswin/winrt |
Graphics and text
| I need to… | Use |
|---|---|
| Fill or stroke a vector path with anti-aliasing | go-gfx/gfx (vector) |
| Rasterise an SVG to a bitmap | go-gfx/gfx/svg |
| Process or transform an image | go-images/images |
| Parse a font and rasterise glyphs | go-opentype/opentype |
| Shape complex text (Arabic, ligatures, marks) | go-opentype/shape |
| Break a paragraph into lines optimally | go-typeset/linebreak |
| Hyphenate a word | go-typeset/hyphenation |
| Order bidirectional text | go-typeset/bidi |
| Write a PDF | go-pdfkit/pdfkit |
| Typeset TeX, or just TeX math | go-tex/engine, go-tex/math |
Get the .cls/.sty files a document asks for | go-tex/texmf |
| Demux MP4 or Matroska | go-avkit/avkit |
Documents and markup
| I need to… | Use |
|---|---|
| Render CommonMark to HTML | go-commonmark/commonmark |
| Parse or query HTML and XML | go-nokogiri/nokogiri |
| Compile SCSS | go-scss/scss |
| Render a Liquid or Mustache template | go-liquid/liquid, go-mustache/mustache |
| Match a regex with lookaround or backreferences | go-regexp/engine — not regexp2 |
| Convert between rich document formats | go-richdoc/richdoc and its converters |
| Parse a date a human wrote | go-datetime/dates |
Storage and filesystems
| I need to… | Use |
|---|---|
| Read a partition table | go-volumes/gpt |
| Address a block device, pool, replica or S3 object as one thing | go-volumes/interface |
| Mount and read ext4, xfs, btrfs, zfs, apfs, ntfs, … | go-filesystems — one repository per format |
| Work out what filesystem an image holds | go-filesystems/detect |
| Read or write UEFI variables | go-filesystems/uefi |
| Convert a qcow2, raw, dmg or tart-oci image | go-diskimages |
| Call a Linux filesystem ioctl | go-fsctl |
| Open a LUKS or APFS volume | go-fde |
| Compress with LZ4, LZFSE or deflate | go-compressions |
| Transfer only what changed | go-deltasync |
| Split a stream into content-defined chunks | go-deltasync/chunk — the one chunker |
| Erasure-code data | go-erasure/reedsolomon |
Firmware, boot and trust
| I need to… | Use |
|---|---|
| Talk to a TPM, extend a PCR, seal a secret | go-tpm2/tpm2 |
| Replay an event log or verify an attestation | go-tpm2/attest |
| Measure into a PCR from UEFI | go-tpm2/efitcg2 |
| Link or sign a PE32+/EFI binary | go-coff/peln, go-coff/pectl |
| Read or patch GRUB or systemd-boot config | go-bootloaders |
Compute
| I need to… | Use |
|---|---|
| Generate Plan 9 assembly for every 64-bit target | go-asmgen/asmgen |
| Speed up a codec, hash or string scan with SIMD | go-simd — one repository per kernel |
| Work with n-dimensional arrays, or multiply matrices | go-ndarray/ndarray |
| Take an FFT | go-fft/fft |
Distributed systems
| I need to… | Use |
|---|---|
| Let many people edit one document | go-crdt/crdt + go-crdt/collab |
| Relay Yjs updates | go-yjs-relay/yrelay |
| Run gRPC over SSH, WireGuard, vsock, WebSocket or WebRTC | grpc-transports |
| Elect a leader or watch host liveness | go-coord/coord |
| Supervise processes as PID 1 | go-proc/supervisor |
| Serve DHCPv4 | go-net-dhcp/dhcp |
| Health-check a backend | go-net-health/health |
| Drive a guest virtio device | go-virtio |
| Run a microVM cloud | openweft/weft |
Packaging and Ruby
| I need to… | Use |
|---|---|
| Install or build a package from a pkgx recipe | go-pkgx/pkgm, go-pkgx/bk |
| Produce an SBOM or sign an artifact | go-attest/sbom, go-attest/sign |
| Compare loose or CalVer versions | go-versions/semver |
| Run Ruby code | go-embedded-ruby/ruby (rbgo) |
| Use a specific gem’s behaviour from Go | the matching go-ruby-* organisation |
| Compile a Puppet catalogue | go-puppet/puppet |