Freight forwarders assist exporters in preparing price quotations by advising on freight costs, port charges, consular fees, costs of special documentation, insurance costs and the handling fees. Freight forwarders reserve the necessary space on a vessel, aircraft, train or truck. Freight forwarders make arrangements with customs brokers overseas to ensure that the goods comply with customs export documentation regulations.

Frequency changer or frequency converter is an electronic device that converts alternating current (AC) of one frequency to alternating current of another frequency. These devices are built out of electromechanical components such as motor-generator sets or rotary converters. They usually consist of a rectifier stage, which is then inverted to produce AC of the desired frequency. The inverter may use thyristors or IGBTs. A battery is also added to the DC circuitry to improve the converter's ride-through of brief outages in the input power. Frequency changers vary in power-handling capability from a few watts to megawatts. They are used to control the speed and torque of the AC motors. In this application, the most typical frequency converter topology is the three-phase two-level voltage source inverter. The phase voltages are controlled using the power semiconductor switches and pulse width modulation (PWM). These converters are typically used to control the speed of pumps and fans. Frequency converter also refers to a much-lower-powered circuit that converts radio frequency signals at one frequency to another frequency. The circuit usually consists of a local oscillator and frequency mixer.

Frequency counter is a measuring instrument which measures frequency range, sensitivity and resolution. The present-day frequency counters are usually of the multi-function type and they can perform the following measurements: frequency, period, ratio of frequencies, totalizing, scaling and time interval. In addition, frequency counters can also be designed to be compatible with the IEEE or IEC interface bus, to enable their operation in automated test and measurement systems. Frequency measurement is performed by totalizing the number of input cycles for a precisely known time period, so that the resulting total count is proportional to the unknown input frequency. The logic circuits internal to the counter position the decimal point automatically or under manual control, so that the display is directly the input frequency. The time reference is usually derived from a precision, high-stability quartz crystal oscillator internal to the counter. Using this basic technique and the ICs available now, it is possible to carry out frequency measurement up to 1000 MHz.