diff --git a/README.md b/README.md
index eb36af4..b4c016d 100644
--- a/README.md
+++ b/README.md
@@ -32,11 +32,11 @@ If you prefer an email, contact me at `toolleeo@gmail.com`.
 
 # Summary
 
-To date, **880** apps/tools covered, organized in **45** categories.
+To date, **881** apps/tools covered, organized in **45** categories.
 
 # Index
 
-[Backup](#backup) (9) | [Calculators](#calc) (9) | [Chat and instant messaging](#chat) (12) | [Commands cheatsheet and snippets](#cheatsheet) (15) | [Conversion](#conversion) (7) | [Data management](#data-management) (38) | [Data transfer](#transfer) (31) | [Directory changers](#cd) (13) | [Disk usage analyzers](#disk-analyzer) (12) | [Editors](#editors) (23) | [Email](#email) (11) | [File and file system handling](#file-handling) (42) | [File manager](#file-manager) (12) | [File renamers](#file-renamer) (11) | [File systems](#file-system) (4) | [Font management](#font) (2) | [Funny tools](#funny) (25) | [Games](#games) (37) | [Git and accessories](#git) (31) | [Graphics](#graphics) (25) | [Multimedia](#multimedia) (7) | [Networking](#networking) (23) | [Note taking](#note-taking) (16) | [Office tools](#office) (17) | [Organizers and calendars](#organizers) (17) | [Online search and resources](#online) (10) | [Password managers](#password-manager) (14) | [Productivity](#productivity) (37) | [Programming](#programming) (33) | [Science](#science) (10) | [Security and encryption](#security) (19) | [Shells](#shells) (8) | [Sound and music](#music) (26) | [System monitoring](#monitor) (32) | [System tools](#system) (32) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (44) | [Text search](#text-search) (10) | [Todo managers](#todo-manager) (21) | [Torrent](#torrent) (7) | [Utilities](#utility) (44) | [Versioning](#versioning) (6) | [Viewers](#viewers) (31) | [Web browser](#browser) (16) | [Web development](#webdev) (22)
+[Backup](#backup) (9) | [Calculators](#calc) (9) | [Chat and instant messaging](#chat) (12) | [Commands cheatsheet and snippets](#cheatsheet) (15) | [Conversion](#conversion) (7) | [Data management](#data-management) (38) | [Data transfer](#transfer) (31) | [Directory changers](#cd) (13) | [Disk usage analyzers](#disk-analyzer) (12) | [Editors](#editors) (23) | [Email](#email) (11) | [File and file system handling](#file-handling) (42) | [File manager](#file-manager) (12) | [File renamers](#file-renamer) (11) | [File systems](#file-system) (4) | [Font management](#font) (2) | [Funny tools](#funny) (25) | [Games](#games) (37) | [Git and accessories](#git) (31) | [Graphics](#graphics) (25) | [Multimedia](#multimedia) (7) | [Networking](#networking) (23) | [Note taking](#note-taking) (16) | [Office tools](#office) (17) | [Organizers and calendars](#organizers) (17) | [Online search and resources](#online) (10) | [Password managers](#password-manager) (14) | [Productivity](#productivity) (37) | [Programming](#programming) (33) | [Science](#science) (10) | [Security and encryption](#security) (20) | [Shells](#shells) (8) | [Sound and music](#music) (26) | [System monitoring](#monitor) (32) | [System tools](#system) (32) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (44) | [Text search](#text-search) (10) | [Todo managers](#todo-manager) (21) | [Torrent](#torrent) (7) | [Utilities](#utility) (44) | [Versioning](#versioning) (6) | [Viewers](#viewers) (31) | [Web browser](#browser) (16) | [Web development](#webdev) (22)
 
 Some links to [related resources](#resources).
 
@@ -726,6 +726,7 @@ Cryptography, ciphered archive managers, encrypted file-systems.
 * [Image Steganography Tool](https://github.com/7thSamurai/steganography) - Simple C++ Encryption and Steganography tool that uses Password-Protected-Encryption to secure a file's contents.
 * [LUKS](https://github.com/guardianproject/luks/wiki) - Hard disk encryption tool; it stores all setup information in the partition header, enabling easy data transport or migration.
 * [Minisign](https://github.com/jedisct1/minisign) - A dead simple tool to sign files and verify digital signatures.
+* [OAuth2c](https://github.com/cloudentity/oauth2c) - A command-line tool for interacting with OAuth 2.0 authorization servers.
 * [ots](https://github.com/sniptt-official/ots) - Share end-to-end encrypted secrets with others via a one-time URL.
 * [PaperAge](https://github.com/matiaskorhonen/paper-age) - Easy and secure paper backups of secrets, which takes a text and generates an encrypted QRcode to print on paper.
 * [pgen](https://github.com/ctsrc/Pgen) - Generate passphrases using the wordlists for random passphrases made by the EFF.
diff --git a/data/apps.csv b/data/apps.csv
index 73cf1c0..421792e 100644
--- a/data/apps.csv
+++ b/data/apps.csv
@@ -879,3 +879,4 @@ file-handling,mat2,,https://0xacab.org/jvoisin/mat2,"Metadata removal tool, supp
 file-handling,Dext,,https://github.com/AfzGit/dext,(Directories by Extensions) is a script that moves (or copies) files of the same extension into a folder.
 utility,upnup,,https://github.com/tomit4/upnup,A command line utility that generates a LICENSE file in the current working directory.
 productivity,kabmat,,https://github.com/PlankCipher/kabmat,TUI program for managing kanban boards with vim-like keybindings.
+security,OAuth2c,,https://github.com/cloudentity/oauth2c,A command-line tool for interacting with OAuth 2.0 authorization servers.