Of course besides information about trekking routes www.trekking-world.com also provides information about trekking agencies which can organise a trek for you in one of the listed countries.
The best way to find relevant trekking agencies is to either use the navigation menu on the left side to find the country, region or city/village of your choice or use the search box in the upper right corner by typing the country, region or city/village of your choice in combination with the term "trekking agencies".
Below you can also find a list of trekking agencies in some of the most visited countries on this website: