Bartlett Labs: Bartlett Labs provides unique, powerful expansion devices for vintage Radio Shack TRS-80 microcomputers.
Bitchin100 DocGarden: Bitchin100 DocGarden is the site for enthusiasts to share documentation, notes, reviews and links to other projects and software related to True Portable Laptops.
Boyson Technologies: Affordable upgrades for your Tandy/Radio Shack Color Computer 1, 2, and 3.
CoCoCoding: This collection is an attempt to gather all of the documentation needed to start programming the CoCo in any given language. All of these items can be found elsewhere, but it can be difficult to sort through the many possible locations and multiple versions to find what you need. In addition to (hopefully) finding the most current versions, I've optimized the PDFs for size and readability and performed Clearscan OCR on most. Using Google Docs, these references can be quickly viewed and searched online.
CoCopedia: The Tandy/Radio Shack Color Computer Wiki.
Club 100: A Model 100 User Group. Tandy/Radio Shack Models 100, 102 and 200. We call these Model “T” computers!
DriveWire 4: DriveWire 4 is an award winning open source connectivity solution for the Tandy Color Computer and similar devices. Using DriveWire 4 you can run a web server on your CoCo, host a multi line internet BBS, transfer files to and from remote computers, send email, control MIDI devices, telnet to and from your Coco, display graphical OS-9 windows on your modern PC, and much more.
Ira Goldklang's TRS-80 Revived Site: This site is devoted to providing extensive information on the line of TRS-80 personal home computers, with a specific focus on the Model I, Model III, and Model 4. There is also SOME information on the Model 100/102, Model 200, Model 600, Color Computer, and Pocket Computer lines as well as Printers. Information from these links includes product descriptions, catalog numbers, pictures, prices, operations, hardware, software, etc.
Radio Shack Catalogs: Views on TRS-80 & Tandy Computer Catalogs.
The Half-Baked Maker: LCD replacement for TRS-80 PC-1 and Sharp PC-1211, TRS-80 PC-3 and Sharp PC-1250/-1251/-1255 pocket computers.
The Right Stuff - the TRS-80 Oldtimer Centre: Hardware support for TRS-80 Model I/III/4, Coco 1-2-3, Tandy 2000 and Tandy MS-DOS semi-compatibles and accessories.
TRS-80 hard drive emulator - FreHD: The project is made with these constraints in mind: Use SD-Card; Easy to build (and reproducible); Open-sourced; Easy to use.
Tvdog's Archive: A mirror of tvdog's excellent collection of Tandy and DOS Internet resources. The Tandy 1000 FAQ alone is worth its weight in gold. If you own a Tandy 1000 series machine, do not pass this up.