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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Flight Sim Hardware A-L
Also, check out the Flight Decks and Retailers pages.
Agronn Agronn logoSimulators, panels, display screens and cockpits. Cockpits are completely functional and replicate real aircraft, simulating all functions essential to normal procedures and true-to-life virtual flights. Also, hardware for sims.
AxisAndOhs AxisAndOhs by Lorby is an external app that replaces the controller (yokes, joysticks etc.) logic in FSX, P3D and MSFS.  It supports native Windows USB Game Controller devices, MIDI devices, Saitek panels, and FIPs. New URL

Axair by Axertions
With these modules, say farewell to mouse and keyboard controls and adjust MCP, radios, and autopilot and more from your desktop. MIAP PRO 24’s sleek, lightweight design features dials, buttons and an engraved back-lighted panel. Also AXAIR MILI23 and Easy PC radios controller.
CH Products CH products logoManufacturer of a popular range of flight control yokes, throttle quadrants, rudder pedals, joysticks and multi-function gaming panels. FAQs and support.
  Chillblast Computer supplier based in England. They offer a range of systems with the processing power to do specific tasks, including running flight sims at high frame rates. You can also design a PC tailored to your own needs and budget.
CP Flight CP Flight Nice bit of kit! For the serious simmer. Boeing 737 Mode Control (autopilot), backlit panel separate Boeing 737 EFIS Selector, and radio stack items. Also, Airbus items and new 747 MCP with EICAS
Flight Panels A team of flight sim enthusiasts creating meticulously crafted MSFS Stream Deck profiles. Our products allow you to effortlessly manage the switches, buttons and dials of your Fenix A320, FlyByWire A32NX, PMDG 737, MS ATR 42/72, and other aircraft through Stream Deck.
Flight Tracker Stream Deck
Plugin
On GitHub, this plugin by Nguyễn Quý Hy for the Elgato Stream Deck hardware allows it to interface with MSFS via SimConnect. The current code targets MSFS but could adapted for P3D. Also at Flightsim.to... Check out this YouTube video...

FlightSim Mods
(at Etsy)
Flight Simulator enthusiasts with a passion for all things flight sim, with a 3D design, print and IRL Pilot background. We produce mods such as a Honeycomb Alpha/Bravo iPad/Tablet Mount, an AXAIR MIAP PRO 24 Desk Stand and a Honeycomb Alpha/Bravo Mount and Trim Whel Covers. 
FlightSimPM FlightSim PM logoFlightSimPM focuses on manufacturing high-quality flight simulator hardware like the 737 throttle quadrant and 737 overhead panels. Also Boeing & Airbus style add-on handles for Saitek throttles. Located in Italy, they ship worldwide.
Flight Sim
Stuff
Producers of 3D-printed controllers. The controllers are handmade and use quality brand-named linear sliders and potentiometers.  No drivers are required. 
Flight Simulators UK Flight Simulators UK has been around for many years, and we provide a comprehensive range of simulation equipment to flight training organisations, universities, colleges and schools worldwide. Joysticks, yokes, throttle & rudders, cockpits, headsets and more... Plus a range of professional simulator setups for flight schools, colleges, etc.
 FreeSim
Stuff.com
Previously Flap Modster. Plans for 3D Printed mods, including flap detents and new handles for Logitech/ Saitek and Honeycomb hardware. Print the mods yourself or choose from a list of print companies.  On YouTube...
FS Force FS ForceFS Force is an add-on module that provides dynamic force feedback in response to changing flight conditions, whether on the ground or in the air. Requires a force feedback joystick. FSx and P3D commpatible.
FSC FSC LogoSpecialising in integrating and supplying customised, static flight simulators for training and entertainment purposes. Also, quality single products like servo-assisted throttle quadrants, yokes and pedals.
 Honeycomb Aeronautical Designers of Alpha Flight Controls, a yoke and back-lit switch panel, and the Bravo Throttle Quadrant with gear and flaps levers, a trim wheel and an autopilot and annunciation panel.
Java Simulator Based in Thailand, Java Simulator designs and develops flight simulator accessories at reasonable prices for people who want their own Flight Simulator cockpit. Airbus components for A320 glare, overhead and pedestal, including an MCDU module.   Further Airbus products coming soon.
Jetline Systems Jetlime Systmes logoJetline Systems designs and builds fast PC systems specifically engineered to handle the needs of intense simulation programs like Microsoft FSX and Lockheed Martin Prepar3D. Ships only to the USA and Canada.
LINDA
(@ Avsim)
LINDA logoLINDA (Lua Integrated Non-complex Device Assigning) is a software interface designed to help make assigning your HID Device/Joystick easier. Specific aircraft modules are available. 32 and 64-bit. Supports VRInsight MCP.
Logitech Logitech logoPreviously Saitek - flight yoke system, rudder pedals, flight switch, radio & multi-panels, and throttle quadrant. Also, joysticks & keyboards. Alternative software: SPAD (Saitek Panels Advanced Driver) and Spad.next
Loupedeck Live profile
(@ Flightsim.to)
Custom profile for Loupedeck Live consoles for use in MSFS. Has 3 touchscreen pages and 6 wheel mappings: including: Altimeter, Elevator, Trim, Avionics Master, Pushback, Heading +/- Altitude +/- and more. Seems some simmers are having problems with these profiles.  Loupedeck website...