@FerenOSChatRoom (apparently soon to be affiliated to the feren OS Dev; unofficial, for now, group)

@ferenos (unofficial channel)

@linuxgram (News Feed; channel)

@Cent_OS_EN (group)

There's a few Fedora groups on Telegram for specific languages or countries. There's also some groups about software included in Fedora. You can find some of them below.
International: @fedora
—
Get help contributing to Fedora: @joinfedora
—
Chinese-speaking: @fedorazh
French-speaking: @fedora_fr
Spanish-speaking: @fedoraesp
Russian-speaking: @russianfedora
Persian-speaking: @FedoraIR
—
Albania: @FedoraAlbania
Czechia: @mojefedora
Ecuador: @FedoraEC
Germany / Austria / Switzerland: @fedoradach
India: @fedoraindia
Indonesia: @FedoraID
Italy: @fedoraita
Latin America: @fedoralat
Mexico: @fedoramexico
Portugal: @fedoraportugal
Sri Lanka: @Fedora_Sri_Lanka
—
CentOS: @Cent_OS_EN
Document Foundation (announce channel): @tdforg
Fedora packagers: @fedorapackager
Free & Open Source: @freeopensource
LibreOffice: @libreoffice
Linux and BSD screenshots: @linuxscreenshot
Nextcloud: @Nextcloud
Qt programming: @CplusplusQt
MusicBrainz: @MusicBrainz
—

Global Group - @Lineageos_group
Channel - @LineageOS

OT - @lineageos_offtopic

@gnulinux_keralam (In Malayalam)

Due to a large Telegram bot network spamming the XDA channels, we have revoked our invite links and made new ones. We have also used a URL shortener to hopefully stop bots from joining. Here are the new invite links:

General Discussion: https://bit.ly/2SRhFNY
XDA News Channel: https://news.1rj.ru/str/xdanews
Chromebook Device Discussion: https://bit.ly/2S1ZhgK
Google Device Discussion: https://bit.ly/2N7mWvg
Huawei/Honor Device Discussion: https://bit.ly/2SSa01N
HTC Device Discussion: https://bit.ly/2Szs8OI
LG Device Discussion: https://bit.ly/2UTNXVO
Motorola Device Discussion: https://bit.ly/2tkcZ4J
Nokia Device Discussion: https://bit.ly/2DzQkpM
OnePlus Device Discussion: https://bit.ly/2N3Z5wN
Samsung Device Discussion: https://bit.ly/2S1DZ2F
Sony Device Discussion: https://bit.ly/2DDUD3k
Xiaomi Device Discussion: https://bit.ly/2EazY8A
XDA Feed/Labs: http://t.me/xda_feed

OpenBSD Jumpstart : https://news.1rj.ru/str/joinchat/EzTjLQuG8MdUSVqFS1xA4w (updated joinlink)

👉US IT Job Postings only👈
https://news.1rj.ru/str/USITJobpostings

👉US IT Trainings & Support only 👈
https://news.1rj.ru/str/USITTrainings

👉🇮🇳 India IT Job Postings only👈
https://news.1rj.ru/str/IndiaITJobPostings

👉DevOps Professionals 👈
https://news.1rj.ru/str/DevOpsProfessionals

👉Web Development Professionals 👈
https://news.1rj.ru/str/joinchat/FE__FUYgzXhhB4nwEwXGIQ

👉SalesForce Professionals 👈
https://news.1rj.ru/str/SalesforceProfessionals

👉SAP Professionals 👈
https://news.1rj.ru/str/SapProfessionals

👉Cloud Professionals 👈
https://news.1rj.ru/str/cloudprofessionals

👉Java & Python 🐍 Professionals 👈
https://news.1rj.ru/str/joinchat/FE__FUTcOmbLD7APsPDJRQ

👉Oracle Professionals👈
https://news.1rj.ru/str/joinchat/FE__FUHVjEOoB6yDY6BVsQ

👉BI & Related technology Professionals👈
https://news.1rj.ru/str/BIProfessionals

👉Project Management Professionals 👈
https://news.1rj.ru/str/joinchat/FE__FU-B-mfcCPrjq2wfhQ

👉Linux Professionals 👈
https://news.1rj.ru/str/joinchat/FE__FUU5haaGjeBPvHNvsQ

👉Mobile (IOS and android) Professionals 👈
https://news.1rj.ru/str/joinchat/FE__FUsbiEn6LKmdt18rSA

👉QA & BA Professionals 👈
https://news.1rj.ru/str/joinchat/FE__FUl10R1jQLIRxn0dWQ

Open Note Scanner, a FOSS picture scanner: @OpenNoteScanner

A fork of Amir's launcher and various cherry-picks from great GitHub people.
Compiled by @shubbyy
Discussion group: @RPLauncher

@ruthlaunch

Channel dedicated to minimalism, programming, hacking and GNU+Linux.
PLTelegram: @pltelegram
Algorithms: @algorithmsTg
cat-v: cat-v.org suckless: http://suckless.org/philosophy

@zerobloat

Android and Tech news for everyone and free 😏

Sources:

+ Android Police
+ Android and Me
+ Android Authority
+ Android Central
+ Android Community
+ Phandroid
+ TechCrunch
+ Engadget
+ The Next Web
+ more coming soon...

Channel maintaned by @jlelseme

@androidandtech

All Unix-like OS interested users group

--> BSD OS specific Group @unitedbsd
--> Linux specific Group: @linux_group
--> Apple user's Group @AppleUsersGroup
--> Privacy Central @privacycentral

News about Deepin Linux and free & open source software​

@deepinchannel