Psinfo shows process information and statistics using the kernel /proc interface.
This information includes:
 Process state, environment, arguments and flags
 CPU usage
 Scheduling
 I/O usage
 Virtual memory status
 Pagefaults
 Capabilities
 Signals

psinfo is useful for providing a detailed view of the current state of an application when diagnosing issues or performance problems.

INSTALLATION

Ncrack is a high-speed network authentication cracking tool. It was built to help companies secure their networks by proactively testing all their hosts and networking devices for poor passwords. Security professionals also rely on Ncrack when auditing their clients. Ncrack was designed using a modular approach, a command-line syntax similar to Nmap and a dynamic engine that can adapt its

A Debian "package", or a Debian archive file, contains the executable files, libraries, and documentation associated with a particular suite of program or set of related programs.

.deb package are just the tar archives but with a proper structural format of  files. You can see and extract any deb package with archive manager tool. From the dpkg-deb man page: “dpkg-deb packs, unpacks and provides

bzip2 compresses files using the Burrows-Wheeler block sorting text compression algorithm, and Huffman coding. Compression is generally considerably better than that achieved by more conventional LZ77/LZ78-based compressors, and approaches the performance of the PPM family of statistical compressors.

bzip2 and bunzip2 are file compression and decompression utilities. The bzip2 and bunzip2