DynamicReports is an open source reporting library based on JasperReports. It allows to create dynamic report designs and it doesn't need a visual report designer. You can very quickly create reports and produce documents which can be displayed, printed or exported into many popular formats such as PDF, Excel, Word and others.

Dynamic report - Java reporting tool

Fast code plugin is a free and open source eclipse plugin designed to help write code faster in J2ee applications. It can be useful with other applications as well. It also has very useful template mechanism feature which helps to generate print/log statements with bunch of fields, create hql, create form fields in a jsp, create struts validation etc.

Fast code plugin - Eclipse plugin to write code faster

im4java is a pure-java interface to the ImageMagick commandline.  im4java just generates the commandline for the ImageMagick commands and passes the generated line to the selected IM-command (using the java.lang.ProcessBuilder.start()-method). 

im4java - java interface to the ImageMagick commandline

TRON is a block chain-based decentralized smart protocol and an application development platform. It allows each user to freely publish, store and own contents and data, and in the decentralized autonomous form, decides an incentive mechanism and enables application developers and content creators through digital asset distribution, circulation and transaction, thus forming a decentralized content entertainment ecosystem.TRON is a product of Web 4.0 and the decentralized internet of next generation.

java-tron - Java implementation of the Tron whitepaper

KouChat is an open source, serverless, LAN chat application for the desktop and Android. With KouChat you can chat and send files to other KouChat users on the same local area network. It’s intended to be used on your network at home, the coffee shop, work place or similar, and does not require any setup, Internet connection or servers to function.

KouChat - Serverless, LAN chat application for the desktop and Android.

Java implementation of Shamir's Secret Sharing algorithm as described in Applied Cryptography [as LaGrange Interpolating Polynomial Scheme].

Shamir Secret Sharing in Java

Bristleback Server is a Java/JavaScript complete WebSockets framework, built on Jetty/Netty/Tomcat as WebSockets protocol engines, perfect for Spring Framework users

Bristleback Server - Java/JavaScript complete WebSockets framework

Chart2d library provides support to generate two dimensional charts. Pie, Line, Bar, Scatter Plot chart types are supported. It supports both integer and real datasets and label formatting, both positive and negative.

Chart2d - Generate two-dimensional charts using Java

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