New Vegas Anti-Crash - As the name suggests, prevents a significant number of potential crashes.Unlike most mods it's a separate patcher and must be manually pointed to your Fallout New Vegas executable rather than installed through any mod manager.
These mods are also listed on the Installation Instructions page. These mods significantly improve game stability and are required for any stable playthrough of Fallout New Vegas, with or without Fallout Who Vegas added.
These mods are considered 'essential' meaning that it is highly recommended to install them for all playthroughs and styles.