W3C Markup Validator and Validator.nu are two useful tools that can be used to validate HTML code. W3C Markup validator allows validating xhtml, html, xml, mathml and more. Validator.nu allows validating HTML 5 code. The W3C Markup validator is written in Perl, while the Validator.nu is written in Java. Both tools are actively being developed.
ReadRedmine is a web based project management and collaboration platform. It is based on the Ruby programming language and the Ruby on Rails framework. Its user friendly and easy to install and configure.
ReadRocket Chat is an excellent open source collaboration tool. It is similar to the close source commercial application Slack. Trello is a commercial Kanban board that allows managing tasks and task lists. It has an attractive interface with many features and a well documented API.
ReadLoad testing a website refers to the process of testing the number of concurrent users that the website is able to support. Whether or not your website attracts lots of visitors, it is useful to know how many users the website can support.
ReadCPU and Memory monitoring is an important system administration task. It provides valuable information that can be used in resource planning and alert notifications.
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