Cytoscape is an open source software platform for visualizing data networks and pathways. Though designed for bioinformatic systems, it has been generalized to complex network analysis and has applications extending to the semantic web. Its core distribution has basic features for data integration and visualization, with additional features available via Java-based plugins.

Gephi is a free, open source interactive visualization and data exploration tool. Users can manipulate the display to uncover new facets of the data, enabling intutive exploration.

UCINET is a software package for analyzing network data, available for purchase and with a 90-day trial period. This tool has been in continuous development since the 1980s, and now includes the capacity to gather and analyze social network data.

Textexture is a free, web-based tool for visualizing texts as a network. The visualization gives a quick visual summary of the text. Clicking on nodes brings up the excerpts the tool has identified as most relivant, and permits users to locate similar texts. Users can upload their own text, or visualize texts from Textexture's library of public texts.

Pajek is a free tool for large network analysis and visualization in continuous development since 1996. It can handle large datasets from diverse sources, such as collaboration networks, citiation networks, data mining, and Internet-derived networks. Pajek is only available for Windows, and was implemented in Delphi (Pascal).

The Ranked Deep Pages from Core Issue Crawler Network is a free, web-based tool for ranking pages based on inlink counts from a user-supplied Issuecrawler XML file. It outputs a three-column table with numbers, the inlink count from the core network, and the inlink count from the periphery of the network.

Netlytic is a free, web-based tool for analyzing and visualizing text and social network data. It enables users to capture data from sources such as social media, blogs or online forums; identify themes and actors; and generate both chain and personal name networks for further analysis and visualization. Users can import datasets from RSS, cloud storage (Google Drive or Dropbox), Twitter, YouTube, Instagram and a plain text file. Results can be exported in formats accessible to other network analysis tools, such as CSV.

NodeXL is a free, open source tool for generating and exploring network graphs from Microsoft Excel files. It is particularly suited to data from social media sources, and includes the ability to directly import data from Twitter, YouTube, Flickr and email, with additional plugins available for gathering data from Facebook, Microsoft Exchange, wikis and URLs. The tool generates visualizations that can be adjusted, zoomed and filtered, with additional features for vertex grouping, graphing metric calculations, and automating tasks. NodeXL can both import and export data in GraphML, Pajek, UCINet and matrix formats.

Leximancer is an application for identifying key concepts in a text, and exploring the results through interactive visualizations and data exports. It includes concept and network cloud visualizations, a sentiment lens, a query system, and multiple data export options for futher analysis. The system accepts texts in a variety of formats including plain text, CSV, HTML and XML, and supports 17 languages beyond English. Users can either purchase a license for the desktop version (Windows and OS X supported), or purchase access to the online LexiPortal, which charges based on months of usage rather than on a subscription basis. A free trial of the LexiPortal is also available.

Project Quincy is a free, open source Django application and MySQL database for tracing the development of social networks and instititions across time and space. Aimed at historians, it enables users to map networks in historical documentation such as biographic, organizational, correspondance or location. Creator Jean Bauer has developed Project Quincy as a single generalizable and extensible database with applications beyond mapping historic connections. All code is available via Github repository, or by contacting the creator directly.