add tessercat, reformed servers

Author: Ahacad

essentials.md

@@ -5,7 +5,7 @@
 - sxiv:      image viewing
 - ranger:    file browser
 - tmux:      easy multiple terminals
-- neovim:    the neo-vim
+- neovim:    the new-vim
 - croc:      transfer files between machines
 - khal:      c(k)alendar
 - musicbox:  listen to netease music
@@ -14,6 +14,7 @@
 - inkscape:  vector graph editor
 - gimp:      graph editor, substitution for photoshop
 - audacity:  audio editor
+- tesseract: OCR
 - latex:     awesome writing tool
 - JabRef:    manage bibtex references
 
@@ -28,21 +29,27 @@
 
 ### server
 
+REMIND: the self-hosted things are generally less powerful than the charged ones,
+except for a few.
+
 - nextcloud: your own cloud storage
 - wekan:     kanban
 - talk:      quick network videos
 - draw.io:   awesome online drawing
+- discourse: forum
+- wiki.js:   wiki pages
+- gitea:     self-hosted github
 
 
 
 ### [others](others)
 
-- Nzh: transform number into Chinese characters
+- Nzh.js: transform number into Chinese characters
 
 
 -------
 
-## The flow:
+## The server flow:
 
 wekan    wiki      github(gitea)
 rocket-chat     nextcloud