added various new apps/software

wiki/android.md

@@ -47,6 +47,8 @@ This section addresses various useful applications.
   application that allows various small tweaks for the Android user interface.
 - [SimpleMarkdown](https://f-droid.org/packages/com.wbrawner.simplemarkdown.free/) is another text
   editor made for Markdown. It does work a bit better with a [NextCloud](/wiki/nextcloud.md).
+- [Fossify](https://github.com/FossifyOrg) is a suite of open-source apps that among other include
+  apps like calendar, file-manager, phone, messages and more.
 
 ## Improve Security and Privacy
 

wiki/deskreen.md

@@ -0,0 +1,5 @@
+# Deskreen
+
+[Deskreen](https://github.com/pavlobu/deskreen) is a tool for [Linux](/wiki/linux.md),
+[Windows](/wiki/windows.md) and MacOS that allows to extend the screen of a device with Deskreen
+installed to a device with any web browser.

wiki/markup_language.md

@@ -2,6 +2,7 @@
 
 A markup Language is way to encode text so that it has great amounts of structure and formatting.
 The most common markup languages are [HTML](#html), Markdown, LaTeX and [XML](#xml).
+Markup languages can be used for [note-taking](/wiki/note-taking.md).
 
 ## Grammar Checking
 

wiki/note-taking.md

@@ -0,0 +1,15 @@
+# Note-taking
+
+Note-taking describes the practice of recording information.
+There are many different ways of setups for note-taking.
+
+## Software
+
+The following list shows various ways of digital note-taking.
+
+- [saber](https://github.com/saber-notes/saber) is a cross-platform app - available for
+  [Android](/wiki/android.md), [Windows](/wiki/windows.md), MacOS and [Linux](/wiki/linux.md).
+  It is mainly used for handwriting notes and annotating PDFs and images.
+- [Markup](/wiki/markup_language.md) languages like Markdown or LaTeX can be used to type notes.
+  An easy template that combines the simplicity of Markdown and the features of LaTeX is
+  [the Eisvogel Panoc-Latex-Template](https://github.com/Wandmalfarbe/pandoc-latex-template).

wiki/signal.md

@@ -19,3 +19,5 @@ export or backup messages.
   MacOS.
 - [sigtop](https://github.com/tbvdm/sigtop) is a utility that allows exporting messages and
   attachments by communicating with a Signal Desktop instance on the same device.
+- [Molly IM](https://github.com/mollyim/mollyim-android) is a security-focussed fork of Signal for
+  [Android](/wiki/android.md).