I discovered two classic (early 1980s) Medkemia Press books available for free download on their web site (unintentionally well-hidden). Medkemia Press is best known for their Cities supplement and for having Raymond Feist designing stuff before he before became a big name author. The two modules available are:

• The Black Tower 49 pages of dungeon goodness (1.6 meg PDF)
  

  The Black Tower is a fully populated castle designed for use with THE TOME OF MIDKEMIA Fantasy Role Playing Game and with some modification it is also compatible with most of the currently available fantasy role playing games and (with more modification) with science-fiction role playing games. It is especially designed as a companion to TULAN OF THE ISLES by Feist and Abrams (MIDKEMIA PRESS). The Black Tower is part of the First Midkemian Campaign along with other MIDKEMIA PRESS playing aids, including THE CITY OF CARSE (by Abrams and Abrams), and CITIES (by Abrams and Everson), as well as TOWNS OF THE OUTLANDS (Edwards, Divin, and Young), JONRIL: GATEWAY TO THE SUNKEN LANDS (by Abrams and Feist), HEART OF THE SUNKEN LANDS (by Rudy Kraft) and other products coming soon. THE BLACK TOWER is a separate game in itself, however, and can be utilized with any game system.

  THIS BOOKLET CONTAINS:
  1) Information about the history and current situation in the castle.
  2) Map enlargements of each floor of the castle, delineating each room. The pages following each enlarged map contain information on each room within that
  section, including descriptions of monsters and treasure, and traps within those
  locations.
  3) Extended descriptions of a large number of new monsters, with a complete listing of abilities.

  WELCOME TO CASTLE TULAN, AND ‘WARE THE BLACK TOWER!

• Towns of the Outlands 79 pages (2 meg PDF)
  

  TOWNS OF THE OUTLANDS is a collection of six fully populated, predominantly human habitations designed to be compatible with any of the currently available fantasy role playing games. With some modification, they are compatible with science-fiction games and modern military role playing in games. It is especially designed for optimum enjoyment when used with the CITIES rules published by MIDKEMIA PRESS. TOWNS OF THE OUTLANDS is designed to be used in conjunction with other MIDKEMIA PRESS playing aids, but can be utilized with any game system. TOWNS OF THE OUTLANDS is part of the FIRST MIDKEMIAN CAMPAIGN, which also includes THE CITY OF CARSE , by Abrams and Abrams, TULAN OF THE ISLES , by Feist and Abrams, T H E BLACK TOWER by Guinasso and Abrams, and THE CITY OF JONRIL by Abrams and Feist, as well as other games by MIDKEMIA PRESS.

  THIS BOOKLET CONTAINS:
  1) Information about the history and current social situation in the towns.
  2) Map enlargements of the towns, delineating each building.

  The pages following each enlarged map contain information on the buildings within that town, including descriptions of those who reside within those locations. While the businesses are developed, the Gamesmaster can easily individualize as few or as many as needed. Should the Gamesmaster not wish to do so, TOWNS OF THE OUTLANDS is sufficiently complete to be used without modification. The six towns contained in this book have been assigned general locations within the campaign. For those Gamesmasters not using the First Midkemian Campaign, general descriptions of the environments are given, allowing each Games Master to place them in any existing campaign as needed. The history and social situation of each town will hopefully provide a rich source of ideas for the Gamesmaster to draw upon, to keep players interested, and to provide ‘established’ towns, without feeling ‘brand new’.

You can find these pdfs on the Medkemia Press website. Select “What’s New” on the left menu. At the bottom of the framed page that appears when you do is a link to the page with the PDF links. They are found at the bottom of this third page.