Free and Open Source Software
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Kraft - handles quotes and invoices - LinuxLinks
Kraft helps to handle your daily quotes and invoices in your small business.
It is a Qt/KF5 based desktop software with a strong focus on ease of use and the just enough feature set for the use case. With Kraft, creating documents will run smooth and free time for more enjoyable things than office work.
This is free and open source software.
Jumpdf - keyboard-focused PDF viewer - LinuxLinks
Jumpdf solves this by having multiple marks/cursors one can switch between. Instead of scrolling, one can create a new mark at the jumpdf location and jump back and forth. In addition, the marks are grouped into groups, which one can also switch between, enabling one to maintain different sets of related marks. For example, in a textbook, one can have a group with marks for the exercises and solutions and another group for reading the material relevant to the exercises. Having these groups also enables one to have a separate window for each group.
Existing PDF viewers like sioyek and zathura also have marks. However, their marks only record locations, whereas in jumpdf, the current mark follows the current cursor, functioning more like tabs. This allows for maintaining multiple views of the document without having to manually reset the marks.
This is free and open source software.