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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Flight Sim Hardware
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
Alpine Computers (UK) Alpine Computers  logoSpecialise in supplying PC systems for the demanding area of flight simulation. Systems are built in high-quality cases with superior PSUs. We will also install and configure your flight sim software for optimum use.

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.
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.
Komodo Simulations Komodo Simulations logoKomodo Simulations result from efforts to create a realistic helicopter control system for the home flight sim pilot to use in professional flight simulators. Cyclics, collectives and pedals.
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...
MobiFlight This open-source project integrates standard hardware with your flight sim. It works with commonly available hardware by SIMioONIC, Octavi, miniCockpit, Core, etc. It supports LEDs, 7-segments, Steppers, Servos, LCDs, etc. On Github...
miniCockpit Get an authentic airline pilot experience with the miniFCU autopilot that emulates the real Airbus unit. Expertly crafted by experienced real-life Airbus Captains, it's affordable, compact, and durable, with unrivalled realism, knobs, switches and backlighting.   miniEFIS!  Facebook...
Novatech Novatech logoUK-based supplier of desktop and gaming PCs, laptops and computer components, including monitors, high-performance video cards, motherboards, RAM, and cooling systems. Next-day delivery is available.
Octavi The Octavi IFR pad is a plug-and-play USB device that requires no driver installation and works on Windows, Mac and Linux. Eight buttons allow you to use the dual-axis multifunction knob for COM1/2, NAV1/2, FMS1/2, transponder and autopilot. Fourteen backlit buttons display the state of the device and the autopilot. Facebook... 
Precision Flight Controls Precision Flight Controls logoMore nice kit! High-quality yokes and pedals, throttle quadrants, cockpits, avionics, computers and displays, accessories and more.
ShakePrint Simulations Producers of Class Echo, an affordable flight sim control panel made specifically for MSFS 2020. It allows you to easily select and set common controls using the touch screen and knob. Self-build kit,  see ESTY page.
SPAD.next SPAD.neXt started as a replacement software for Saitek Flight Sim Panels. SPAD.neXt provides almost unlimited options to configure your panels for many uses. Other hardware is also supported, and the high flexibility of SPAD.neXt can take your experience to the neXt level.
Speedlink PC and Xbox gaming hardware, including headsets, keyboards, joysticks and controllers. Chairs, desks, PCs, and notebook accessories. Order directly from their online store.
Stream Deck by Elgato A stream deck is a customisable control surface that plugs into your computer and allows you to perform various tasks by pressing a button. Originally used by content creators, it is now used by gamers. It requires dedicated software to program the buttons to execute the desired commands.
Throttletek Throttletek logoThrottletek offers excellent USB plug-and-play replica backlit throttle hardware at the best possible prices! Designed and tested by real airline pilots. Boeing 737, Boeing 767, Airbus A320, Embraer and Learjet throttles available.
Thrustmaster Thrusmaster logoManufacturers of the original HOTAS Cougar™ throttle and stick and other force feedback joysticks, steering wheels and control pads. New TCA Airbus Edition range.
Turtle Beach Manufacturers and suppliers of a wide range of gaming hardware. Their advanced Velocityone flight sim products include a yoke/control system, rudder pedals, a joystick, and a stick and throttle combo. 
Virpil Controls A project created by passionate flight-sim enthusiasts looking to revolutionise the sim controller market. Since 2016, we have brought highly versatile, high-precision, exciting controllers to the market. Flightsticks, collectives, throttles etc. Advanced Flight Yoke soon.  Facebook...
Virtual-Fly VirtualFlyHigh-end, professional and home products, including solo and dual flight panels in various configurations, avionics, 'Yoko+' yoke, throttle quadrant and pedals, and static and full motion flight simulators.
VKB Sim VKBSim logoVKB is an engineering and manufacturing company that produces a range of high-quality cockpit modules and controllers, such as throttles, joysticks, rudder pedals, mounts and accessories for flight and space simulator enthusiasts.  Facebook...
Volair Sim VolairSimThe flight sim open-frame cockpit features factory pre-drilled mounting locations for all of the Saitek Pro Flight accessories. Fully-adjustable steel frame and genuine car racing seat with recline. Mounts multi-monitors. 
WinWing Chengdu WinWing Tech Co., Ltd, established in March 2013, specialises in the research, development, production and sale of Flight simulation training devices and provides efficient customer service around the globe. Full-Size FCU Panel, metal flight rudder pedestals, throttles and joysticks.