Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

comment_form_alter in modules/comment.module
forum_form_alter in modules/forum.module
Implementation of hook_form_alter().
menu_form_alter in modules/menu.module
Implementation of hook_form_alter(). Add menu item fields to the node form.
multipage_form_example_form_alter in developer/examples/multipage_form_example.module
Implementation of hook_form_alter(). Here, we set up the 'page' field, which keeps track of what stage the form is in.
nodeapi_example_form_alter in developer/examples/nodeapi_example.module
Implementation of hook_form_alter().
node_access_example_form_alter in developer/examples/node_access_example.module
Implementation of hook_form_alter().
node_form_alter in modules/node.module
Implementation of hook_form_alter().
path_form_alter in modules/path.module
Implementation of hook_form_alter().
taxonomy_form_alter in modules/taxonomy.module
Generate a form for selecting terms to associate with a node.
upload_form_alter in modules/upload.module