Turing Machines:
A Turing machine is a theoretical computing device that manipulates symbols on a tape according to a set of rules. It is a mathematical model of a general-purpose computer and forms the basis for the theory of computation.

One Tape Turing Machines:
A one-tape Turing machine is a type of Turing machine that has a single tape on which it can read and write symbols. The tape is divided into cells, each of which can hold a symbol. The machine has a head that can move left or right along the tape and can read the symbol at the current cell or write a new symbol to the current cell.

Construction of One Tape Turing Machines:
The construction of one-tape Turing machines involves designing the transition function, which determines the machine's behavior based on the current state and the symbol read from the tape. The transition function specifies the new state, the symbol to be written, and the direction the head should move.

JFLAP:
JFLAP is a software package developed at the University of San Francisco that allows users to interactively construct and simulate various types of automata, including Turing machines. It provides a graphical user interface for constructing Turing machines and visualizing their operation.

NFLAP:
NFLAP is not a valid term or software package related to Turing machines or their construction. It seems to be a typo or an incorrect reference.

Conclusion:
Based on the given options, JFLAP is the only software package related to the construction of one-tape Turing machines. JFLAP provides a user-friendly interface for designing and simulating Turing machines, including one-tape Turing machines. The construction process involves designing the transition function, which determines the machine's behavior based on the current state and the symbol read from the tape. JFLAP allows users to construct and visualize the behavior of one-tape Turing machines, making it a valuable tool for studying and understanding the theory of computation.