For those who admire Euler ...
The Euler Archive - the works of Leonhard Euler online
This site provides Euler's original works , 866 essays on many topics in Math. and Physics . Howeve , the original works were not printed in English , I guess the language he used is Latin , i don't know (Worried)
Luckily , for titles , it provides English version and for the contents , some important paper have been translated to English . I am sure you will find something that you have never met (Happy)
Another good thing is It is also available for us to download and print ! ( it provides us the bottons )