Not a CLI tool, but I recently started using https://klogg.filimonov.dev/ klogg (which seems to be a successor of glogg) more and more often. - Source: Hacker News / 16 days ago

Glogg is a great tool, but unfortunately it is not developed anymore. I maintain a fork -- klogg (https://klogg.filimonov.dev). It is generally faster for both opening a file and performing searches. Current dev builds that use hyperscan regular expression engine can open a file and do a search while glogg would still be indexing that file. Source: about 2 years ago

Once I had to go through an unusually large log file which was around 2GB. I am a regular Notepad++ user but it couldn't handle the file. In addition to opening the file I also needed to search around the file for keywords like Error or Exception. I found klogg to be just the right tool for me. It allows for viewing as well searching for words within the large text file easily. - Source: dev.to / over 2 years ago

This is still an early stage TUI, many widgets are incomplete or missing (i.e. Text area, partial keyboard support, incomprehensible Documentation) I have very little time to work on it and the progresses are incredibly slow. I develop it in order to create a terminal log viewer that could mimic the features exposed by glogg or klogg. Source: over 2 years ago

Please note that the original app was Xournal [1]. The one you link is a rewrite of the orignal (in C++) and is called Xournal++. [1] https://xournal.sourceforge.net/. - Source: Hacker News / 4 months ago

I do the using Xournal [1] which is tailor-made for creating annotations. It leaves the PDF as is, saving your edits to a sidecar file (*.xoj) which when loaded pulls in the original PDF. It exports edited documents to 'real' PDFs with selectable text etc. [1] https://xournal.sourceforge.net/ (packaged by most distributions). - Source: Hacker News / almost 2 years ago

If you don't mind the signature being raster (not vector), I've used Xournal for this in the past. It's extremely lightweight and easy. Just open the PDF file with Xournal, draw the signature, and then export it to PDF (Control + E). This will not rasterise the PDF itself (to the best of my knowledge), but rather just superimposes a layer containing your signature on top of the original PDF. Source: about 2 years ago

Xournal++ exists since 2013. Maybe you typoed and by your comment about abandoning you were referring to Xournal without the ++? The Xournal website even suggests to try Xournal++. Source: over 2 years ago

Xournal works pretty well for me on GNU/Linux. You just have to turn on the "Legacy PDF Export" option. Source: almost 3 years ago