To the "Services" section of the Herbert ten Thij web-site at http://www.thij.net
 Herbert 
 ten Thij -
 Utilities:
 Utilities: 
 - The Weather 
  -- Current Conditions 
      and 10 Days Forecast 
      (with Satellite Map) -- ; 
  - Searches and Search Engines ; 
  - Calculators : 
   -- Calculators ; 
   -- Molar Mass- and
       molar mass by 
       percentage - calculator ;
   -- Matrix Operations calculator 
       (solve a system 
        of lineair equations) ;
   -- Units Conversions Calculators 
       (distance, weight and volume).