Electronics15
- HackadayDaily hacks and teardowns
- Hackaday.ioCommunity project logs
- Adafruit LearnTutorials that actually work
- SparkFunGuides and parts
- InstructablesStep-by-step builds
- Hackster.ioBoards, IoT and AI projects
- EEVblogElectronics videos and forum
- Ben EaterBuild a computer from scratch
- KiCadOpen-source PCB design
- JLCPCBCheap PCBs and assembly
- OSH ParkPurple boards, made in the USA
- Falstad Circuit SimulatorLive circuits in the browser
- WokwiSimulate Arduino and ESP32
- OctopartSearch parts and stock
- TindieIndie hardware marketplace
Microcontrollers and SBCs11
- Raspberry Pi DocsOfficial documentation
- Arduino DocsReference and tutorials
- Espressif DocsESP32 and ESP8266 manuals
- ESPHomeConfigure ESP devices with YAML
- TasmotaOpen firmware for smart plugs
- MicroPythonPython on tiny chips
- CircuitPythonBeginner-friendly embedded Python
- PlatformIOEmbedded development tooling
- Pinout.xyzRaspberry Pi GPIO pinouts
- PimoroniPi add-ons and gadgets
- Flipper ZeroPocket multi-tool for hardware hackers
3D printing and CAD12
- PrintablesModels from Prusa
- MakerWorldModels from Bambu Lab
- ThingiverseThe long-running model library
- Prusa Knowledge BaseTroubleshooting for any printer
- KlipperFast, flexible printer firmware
- OctoPrintRemote control for your printer
- Teaching Tech CalibrationTune your printer step by step
- FreeCADOpen-source parametric CAD
- OpenSCADDesign solid objects with code
- OnshapeCAD in the browser
- BlenderModeling, rendering and animation
- Voron DesignOpen-source high-end printers
Self-hosting and homelab13
- awesome-selfhostedDirectory of apps worth running
- selfh.stWeekly self-hosting news
- r/selfhostedCommunity and show-and-tell
- r/homelabRacks, NAS builds and mini PCs
- Home AssistantLocal-first home automation
- ProxmoxVirtualization platform
- TrueNASStorage and apps
- TailscaleEasy mesh VPN
- Pi-holeNetwork-wide ad blocking
- Uptime KumaSelf-hosted status monitoring
- LinuxServer.ioWell-maintained container images
- ServeTheHomeServer and networking hardware
- Docker HubContainer image registry
Linux and dev tools11
- Arch WikiBest Linux docs, any distro
- explainshellPaste a command, see what it does
- tldr pagesShort command cheat sheets
- ShellCheckLint your shell scripts
- crontab.guruCron schedule editor
- Compiler ExplorerSee the assembly your code makes
- regex101Build and debug regexes
- DevDocsFast offline API docs
- CyberChefThe cyber Swiss Army knife
- ExcalidrawHand-drawn style diagrams
- Can I useBrowser support tables
Security and networking11
- OverTheWireLearn security through games
- Hack The BoxHands-on hacking labs
- TryHackMeGuided security learning
- PortSwigger AcademyFree web security course
- OWASPApplication security standards
- WiresharkPacket analysis
- NmapNetwork scanner and guide
- ShodanSearch engine for devices
- Have I Been PwnedCheck for breached accounts
- SSL LabsTest a server’s TLS setup
- Krebs on SecurityInvestigative security news
Workshop and repair8
Radio, retro and rabbit holes10
- RTL-SDRSoftware radio on a budget
- WebSDRListen to radios around the world
- QRZAmateur radio callbook
- ADS-B ExchangeUnfiltered flight tracking
- Radio GardenSpin the globe, hear live radio
- Internet ArchiveSoftware, books and the Wayback Machine
- BitsaversScanned vintage computer manuals
- Computer History MuseumStories of computing
- RetroPieRetro gaming on a Raspberry Pi
- ShadertoyGraphics demos written in code
Learn and read9
- Hacker NewsTech news and discussion
- LobstersInvite-only tech links
- LWN.netLinux and kernel news
- PhoronixLinux hardware and benchmarks
- Ars TechnicaTechnology reporting
- The RegisterIT news with an attitude
- Nand to TetrisBuild a computer, starting with logic gates
- MIT OpenCourseWareFree university courses
- xkcdWebcomic of romance, sarcasm, math and language