Wikipedia:WikiProject Check Wikipedia

Checkwiki helps clean up syntax and other errors in the source code of Wikipedia by:

• Eliminating errors in the wiki syntax, such as missing close tags or brackets;
• Checking for accessibility issues, such as small print or heading problems;
• Correcting, deleting or moving code that does not follow conventions, such as the position of references with respect to punctuation;
• Finding articles that have invalid ISBNs (list available here)