WPS Spreadsheets is a free spreadsheet, characterized by rich functionality and low consumption of system resources. It was created by the Chinese on the example of an Excel 2003 application and is perfectly suited for simple and more complex calculations.
GS-Base is an extensive but easy to use database program of Polish authorship. It allows creating databases, with an unlimited number of records, in which each of them contains up to 2047 fields (text, numeric, with OLE objects, etc.).
OneNote 2016 is a universal and powerful tool for creating notes and planning, made available by Microsoft for users of Windows 7/8 and Mac OS, as well as mobile devices with Windows Phone, Android and iOS.
LibreOffice is a powerful office application suite that includes all the most necessary tools for working with documents, such as text, spreadsheet and image editor, presentation wizard, formula editor and database management module
ELISOFT Invoices is a very good and free invoicing application that allows you to conveniently document all sales and purchase transactions. It also offers the functions of creating and managing a database of contractors, employees and goods and services useful in most companies.
The JPK program is a software for generating JPK (short for: Uniform Control File) on the basis of various data, merging multiple JPK files and encrypting, signing and sending JPK to the Ministry of Finance. Importantly, the application can work with any ERP system.
LanguageTool is an addition to LibreOffice and OpenOffice, allowing you to use the LanguageTool.org open proofing tools. Thanks to this you can check grammar, punctuation and find many mistakes that can not be found in the traditional dictionary.