Telegram is a messenger that allows you to exchange text and voice messages and media files of many formats. It uses a proprietary server part with closed code, running on the capacities of several companies.

In addition to the standard exchange of messages in dialogs and groups, the messenger can store an unlimited number of files, maintain channels (microblogs), create and use bots.

Microsoft Teams — an enterprise platform that integrates chat, meetings, notes, and attachments into a workspace. Developed by Microsoft as a competitor to the popular corporate solution Slack.

Zoom is a program for organizing video conferencing. It provides a video telephony service that allows you to connect up to 100 devices simultaneously for free, with a 40-minute limit for free accounts.

This is a high-quality viewer/cataloger/converter of graphic files, supporting a large number of formats and has many additional functions.

PeaZip is an archive manager. It is a single, unified GUI for working with multiple open source data compression technologies (7-Zip, FreeArc, UPX, ZPAQ), as a free alternative to traditional Zip file utilities such as WinZip and WinRar.

Opens and decompresses over 180 archive formats and variants, including ACE, CAB, ISO, RAR, ZIPX... Compress (and convert to) 7Z, BALZ/BCM/QUAD, BZ2, GZ, FreeARC, *PAQ, PEA, TAR files , WIM, XZ and ZIP.

PeaZip also has its own Pea archive format (with support for compression, multi-volume archives and a flexible encryption and integrity control system).

ZenMap (NMap) is a deep network or host scanner for determining the state of scanned objects (ports and corresponding services).
The following methods are used for scanning: UDP, TCP (connect), TCP SYN (half-open), FTP-proxy (breakthrough via ftp), Reverse-ident, ICMP (ping), FIN, ACK, Xmas tree, SYN and NULL scanning, etc.
Additional features: OS detection, "invisible" scanning, dynamic delay calculation and packet retransmission, parallel scanning, detection of inactive hosts, scanning using false hosts, detection of the presence of packet filters, direct RPC scanning, scanning using IP fragmentation, etc.

The utility removes cache, internet history, temporary files, cookies and other unnecessary files and frees up disk space.

It can also ensure privacy is maintained by removing unwanted information and deep cleaning.

Processes and cleans temporary files of Adobe Reader, Bash, Beagle, Firefox, Flash, GIMP, Google Earth, Java, KDE, LibreOffice.org, Opera, RealPlayer, rpmbuild, Second Life Viewer, VIM, XChat, and many more.

Kdiskmark - testing hard drives (HDD) and solid state drives (SSD/NVMe). It invokes the Flexible I/O Tester and processes the output, making complex test results easy to view and interpret.

Features:
* configurable block size, queues, and threads count for each test
* many languages support
* report generation

QDiskInfo is a frontend for smartctl (smartmontools). It provides a user experience similar to CrystalDiskInfo.

It shows the SMART (Self-Monitoring, Analysis, and Reporting Technology) data of modern HDD, SSD and NVMe drives.

Rigs of Rods - simulates automobile, water, rail, aviation and other transport, which uses soft body physics to simulate the destruction and deformation of vehicles when moving, showing extremely accurate behavior of objects.

It allows you to accurately simulate flexible, soft bodies that are completely dependent on the physical design of what you are doing.