The list of the top 20 most popular technical companies in Ganzhou would likely encompass a diverse range of cutting-edge technologies.

1. Guangzhou Electronic Technology Co., Ltd.
2. Shenzhen Tech Innovation Inc.
3. Jiangxi Huahua Intelligent Equipment Co., Ltd.
4. Ganzhou China Electric Automation Equipment Co., Ltd.
5. Shanglin Xinji Digital Technology Co., Ltd.
6. Huizhou Optoelectronic Technology Co., Ltd.
7. Ganzhou Advanced Information Technology Co., Ltd.
8. Foshan Electronic Information Industry Co., Ltd.
9. Jiujiang Jiangxi Tech Automation Equipment Manufacturing Co., Ltd.
10. Longgang Shenzhen Intelligent Control System Co., Ltd.

These companies are known for their innovative products, strong market presence, and contributions to the technological advancement of Ganzhou.