Open Source Tools: Open Source Tools are free software available to the consumers. There are many types of Open Source Tools available which has seen a considerable rise with the advent of internet. The diverse platforms of Open Source Tools include peer-to -peer networking, video and audio streaming, programs for writing text, multimedia solutions et al. The users of Open source tools have also access to the source code, so that they can alter part of the program to suit their needs.

Open Reading Frame: Open reading frame (ORF) refers to the sequence of DNA or RNA that is located between the initiation codon (start-code sequence) and termination codon (stop-code sequence).

Optoelectronics: Optoelectronics also known alternately as Photonics is a branch of physics, especially electronics that uses light for processing and transferring data. Optoelectronics is today an integral part of everyday life. Devices like Barcode reader, CD player, TV remote control are few examples of Optoelectronics.

Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing (OFDM) is a method of broadband multicarrier modulation. In this method, a signal is allowed to split into numerous narrowband channels at varying frequencies. In the UHF and microwave spectrum, OFDM is fine with high-speed digital data transmission, superior performance and wide benefits.

Ontology: In the realm of IT and Computer Science, Ontology refers to the exact description of things as well as their relationships. In the context of web, Ontology is precisely describing the web information and relationships between web information.

Orca: Orca is a free, open source, screen reading and magnification software for visually challenged people.