ADD: o

README.md

@@ -21,11 +21,11 @@ If you want to contribute through a pull request, make sure to add new entries t
 
 # Summary
 
-To date, **562** apps/tools covered, divided in **43** categories.
+To date, **563** apps/tools covered, divided in **43** categories.
 
 # Index
 
-[Backup](#backup) (8) | [Calculators](#calc) (4) | [Chat and instant messaging](#chat) (8) | [Conversion](#conversion) (6) | [Data management](#data-management) (25) | [Data transfer](#transfer) (25) | [Directory changers](#cd) (8) | [Disk usage analyzers](#disk-analyzer) (8) | [Editors](#editors) (18) | [Email](#email) (9) | [File and file system handling](#file-handling) (31) | [File manager](#file-manager) (9) | [File renamers](#file-renamer) (6) | [File systems](#file-system) (3) | [Font management](#font) (2) | [Funny tools](#funny) (13) | [Games](#games) (26) | [Git and accessories](#git) (16) | [Graphics](#graphics) (14) | [Multimedia](#multimedia) (2) | [Networking](#networking) (13) | [Note taking](#note-taking) (11) | [Office tools](#office) (14) | [Organizers and calendars](#organizers) (12) | [Online search and resources](#online) (6) | [Password managers](#password-manager) (9) | [Productivity](#productivity) (16) | [Programming](#programming) (15) | [Science](#science) (8) | [Security and encryption](#security) (8) | [Shells](#shells) (4) | [Sound and music](#music) (22) | [System monitoring](#monitor) (24) | [System tools](#system) (19) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (30) | [Text search](#text-search) (9) | [Todo managers](#todo-manager) (14) | [Utilities](#utility) (20) | [Versioning](#versioning) (5) | [Viewers](#viewers) (25) | [Web browser](#browser) (16) | [Web development](#webdev) (12)
+[Backup](#backup) (8) | [Calculators](#calc) (4) | [Chat and instant messaging](#chat) (8) | [Conversion](#conversion) (6) | [Data management](#data-management) (25) | [Data transfer](#transfer) (25) | [Directory changers](#cd) (8) | [Disk usage analyzers](#disk-analyzer) (8) | [Editors](#editors) (19) | [Email](#email) (9) | [File and file system handling](#file-handling) (31) | [File manager](#file-manager) (9) | [File renamers](#file-renamer) (6) | [File systems](#file-system) (3) | [Font management](#font) (2) | [Funny tools](#funny) (13) | [Games](#games) (26) | [Git and accessories](#git) (16) | [Graphics](#graphics) (14) | [Multimedia](#multimedia) (2) | [Networking](#networking) (13) | [Note taking](#note-taking) (11) | [Office tools](#office) (14) | [Organizers and calendars](#organizers) (12) | [Online search and resources](#online) (6) | [Password managers](#password-manager) (9) | [Productivity](#productivity) (16) | [Programming](#programming) (15) | [Science](#science) (8) | [Security and encryption](#security) (8) | [Shells](#shells) (4) | [Sound and music](#music) (22) | [System monitoring](#monitor) (24) | [System tools](#system) (19) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (30) | [Text search](#text-search) (9) | [Todo managers](#todo-manager) (14) | [Utilities](#utility) (20) | [Versioning](#versioning) (5) | [Viewers](#viewers) (25) | [Web browser](#browser) (16) | [Web development](#webdev) (12)
 
 Some links to [related resources](#resources).
 
@@ -158,6 +158,7 @@ Some links to [related resources](#resources).
 * [micro](https://github.com/zyedidia/micro/) - A terminal-based text editor written in Go that aims to be easy to use and intuitive, while also taking advantage of the full capabilities of modern terminals.
 * [nano](https://www.nano-editor.org/) - Easy to use, lightweigth text editor; no complex keybindings to remember.
 * [neovim](https://neovim.io/) - A work in progress attempt to improve [vim](http://www.vim.org/), dropping older/unused OS compatibility, improving the codebase readability, modularity and maintainability; it has chances to become the next choice of vim users.
+* [o](https://github.com/xyproto/o) - Configuration-free text editor and IDE limited to VT100. Suitable for writing git commit messages, editing Markdown, config files, source code, viewing man pages and for quick edit-compile cycles when programming.
 * [slap](https://github.com/slap-editor/slap) - Text editor inspired by [Sublime Text](https://www.sublimetext.com/) written in NodeJS; extedable in Javascript.  
 * [vai](https://github.com/stefanoborini/vai) - A text editor similar to `vim` written in Python; many feature are nicely replicated, some are still missing; however, the advantage of this implementation is its simplicity, maintainability and extensibility, thanks to the Python implementation.
 * [vim](http://www.vim.org/) - Historically one of the preferred text editors; behavior based on editing modes; plenty of plugins and tips to address every possible editing problem.  

data/apps.csv

@@ -561,3 +561,4 @@ email,pymailgen,https://github.com/toolleeo/pymailgen,"Starting from the content
 science,FAWOC,https://github.com/robolab-pavia/fawoc,FAWOC is a TUI program for manually labelling a list of words. It has been developed to support the efficient clustering of documents based on topic modeling algorithms such as Dirichlet Latent Allocation.
 science,slr-kit,https://github.com/robolab-pavia/slr-kit,Set of CLI tools to assist the writing of Systematic Literature Reviews powered by Natural Language Processing.
 editors,Helix,https://github.com/helix-editor/helix,"A kakoune / neovim inspired editor, written in Rust. The editing model is very heavily based on kakoune."
+editors,o,https://github.com/xyproto/o,"Configuration-free text editor and IDE limited to VT100. Suitable for writing git commit messages, editing Markdown, config files, source code, viewing man pages and for quick edit-compile cycles when programming."