Add column to plugins table screen

First, you have to add the custom column to the plugin column names:

function wpa65189_add_plugins_column( $columns ) {
    $columns['wpa65189_column'] = 'wpa65189 Custom Column';
    return $columns;
}
add_filter( 'manage_plugins_columns', 'wpa65189_add_plugins_column' );

Then output your column data for your plugin:

function wpa65189_render_plugins_column( $column_name, $plugin_file, $plugin_data ) {
    if ( 'wpa65189_column' == $column_name && 'My Plugin Name' == $plugin_data['Name'] ) :
        echo 'My Plugin custom column data';
    endif;
}
add_action( 'manage_plugins_custom_column' , 'wpa65189_render_plugins_column', 10, 3 );