1. Hanoikids

Established in 2006, Hanoikids is a voluntary English tour-guiding club run by young, friendly, and ambitious students who love Hanoi. 

They offer free tours to various attractions, including the Old Quarter, Temple of Literature, and Ho Chi Minh Mausoleum. 

Tours are typically within a day and provide insights into Vietnamese culture and traditions. 

2. Hanoi Free Walking Tours

Founded in late 2012, this student-run organization provides free walking tours around Hanoi. 

They offer a variety of tours, such as the Old Quarter Walking Tour, French Quarter Walking Tour, and Street Food Tour. 

Each tour is designed to showcase different aspects of Hanoi's charm and heritage. 

3. Hanoi Free Private Tour Guide

This club offers personalized private tours guided by enthusiastic local volunteers. 

Tours are tailored to suit your interests and can include visits to historical sites, cultural landmarks, and local markets. 

Options range from the Old Quarter Walking Tour to the Hanoi Street Foods Tour. 

4. Hanoi Free Local Tours

Managed by a group of students and young professionals, this organization offers various free tours, including motorbike tours, half-day tours, and full-day tours. 

Their aim is to provide international tourists with authentic local experiences while helping guides improve their language skills. 

Advance Booking: It's advisable to book your tour in advance through the respective organization's website to ensure availability.

Customization: Many tours can be tailored to your interests, so feel free to communicate your preferences when booking.

Gratuities: While the tours are free, guides often appreciate tips as a token of gratitude. 

The amount is at your discretion, but it's a nice way to acknowledge their effort and time.

By participating in these free tours, you'll gain a deeper understanding of Hanoi's history, culture, and daily life, all through the eyes of passionate local guides.