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Katekyo Hitman REBORN!
家庭教師ヒットマンREBORN!
가정교사 히트맨 리본!
Gia sư Hitman Reborn!
Mon Prof le Tueur Reborn !
Reborn!
Tutor Hitman Reborn!
Репетитор-киллер Реборн!
القاتل الماجور ريبورن
ครูพิเศษจอมป่วน รีบอร์น!
家庭教师REBORN!
家庭教師HITMAN REBORN!

Side Story

manga
Reborn vs Evil Hitmen is the 176.1st chapter of Akira Amano's Katekyo Hitman Reborn! and is assumed to take place before the Future Arc, therefore this chapter takes place in Namimori present. 

*Note: This one-shot was published on the magazine Jump Heroes on June 30, 2005 as a special chapter. Then it was recompiled in the databook Katekyo Hitman Reborn! Vongola 77.*

Side Story

novel
Written by Hideaki Koyasu and illustrated by Akira Amano, the novels were originally serialized in Jump Square.

Hidden Bullet 1: Mukuro's Illusions, and it was released on March 12, 2007.

Hidden Bullet 2: X-Fiamma, was released on February 4, 2008.

Hidden Bullet 3: Millefiore Panic, was published on July 3, 2009.

Hidden Bullet 4: The Funeral Flower Withers

Hidden Bullet 5: Simon Cooking!

\[Wikipedia\]

Spin-off

manga
Vongola GP (Gran Prix) is spin-off series of Katekyo Hitman Reborn!, made by Takayama Toshinori.

Manga introduces Tsunayoshi Sawada, called No-Good Tsuna who is descendant of world's legendary racer, Primo and his side-kick Gokudera Hayato. They battle on various members from the original Katekyo Hitman Reborn! plot.

Other

manga
An 8-page extra published with the 2009 No.11 issue of Weekly Shounen Jump that features a page or 3 from the following series: Hitman Reborn, Bakuman, Eyeshield 21,  Sket Dance, and To Love-Ru.