The Apache Commons IO library contains utility classes, stream implementations, file filters,

Provides interfaces for encrypting and decrypting bytes, text, and files

Utility library for throwable objects like get the stacktrace as string from java

Utility library for collections, comparators and iterator classes

Provides utility classes for the java String class

Provides FileFilter and FilenameFilter classes

Utility library that provides some generic data beans like pair, triple and quattro

Simply compare java objects

Project that provides utility classes for calculate checksums for files, byte arrays and objects

Zip4j - A Java library for zip files and streams

Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are ...