Here are links to the Catechisms, a Q-and-A site, etc.:

1. Index for the Catechism of the Catholic Church (1992).

2. Search engine for the CCC.

3. Great links, including searches of CCC in four languages

4. Nazareth multi-catechism site.

5. Link #1 and link #2 to personal answers to your questions (and those of others) about doctrine and morality.

6. The Holy See's English home page

Here are links to other faiths' sites, for the purpose of comparison:

1. Lutheran works (Concord, etc.)

2. Watchtower (JW) official site.