There are three algorithms discussed.

1. "Wu-style" circle anti-aliased algorithm. Source. Demo.
2. "Linear-constraint" circle algoritm. Source. Demo.
3. Implicit curve anti-aliased algorithm. Draft. Source. Concept-Demo.


The first algorithm uses sqrt function either 
to precalculate fractions of sqrt or 
to calculate sqrt when calculating intensities of the pixels.
Here are the legacy pages

The second and third algorithms do not use sqrt function and any of float or
double precision operations. Only integers are used.

 bibliography.txt 
 readme.txt 
 links.txt 

 AAC 

 implicit_curve.htm 
 implicit_ellipse.png 
 implicit_line.png 

 src 

 Algorithm.java 

 bin 

 Algorithm1317747549642.html 
 java.policy.applet 

 WU 

 wu_lemma_big.png 
 linear_constraint.htm 
 NoSqrt.rb 
 WU4c_with_wu_lemma.zip 
 compare.png 
 wu.htm 
 wu_lemma.htm 
 wu_lemma.png 

 src 

 WUCircle.java 
 NoSqrt.java 

 bin 

Credits.
Copyright (C) 2011 Konstantin Kirillov. MIT License