What are some agencies that can assist with the Non-B visa application process in Thailand?

Multiple users recommend agencies and methods for obtaining a Non-B visa in Thailand. Suggestions include contacting specific agencies like Air Holiday and Mots Services, while others encourage going directly to the immigration office or getting assistance from your employer. Some comments note the common requirement to apply for the visa at a Thai embassy abroad after gathering necessary paperwork, but mention that agents can help with this process for a fee.