PC Software:

Stellarium: Stellarium is planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free.

KStar: KStars is a Desktop Planetarium for KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time. The display includes 130,000 stars, 13,000 deep-sky objects,all 8 planets, the Sun and Moon, and thousands of comets and asteroids.

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Mobile software:

Mobile Planetarium: An Sideralis like done by an Asian guy.

Starmap: Looks like a great planetarium for iPhone (never tested). Not for free unfortunately.

Sky Map: A planetarium for Android phone (Google phone).

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Sites referencing Sideralis:

GetJar - Free Java, Symbian, Windows Mobile, BlackBerry, Palm and Flash Lite mobile games and applications:

MobileRated - Free Mobile Phone Games

Phoload - Free Mobile Software

megamobilecontent.com - Misc contents for your mobile

Softoxi - The software foundry

Softpedia - Softwares for various platforms

ClickApps - Mobile Phone Software for your Mobile Phone, PDA and Smartphone.

GameJump - Mobile games free

freeware symbian - freeware for your symbian mobiles

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Astronomy links:

Emilie Bodin: An interesting and general french astronomy site. Here I found the first explanation for stars position calculation.

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Miscellaneous:

TennisRanking (only in French): For french tennis player. It stores on your mobile phone games results and estimates ranking for next year.

Luc Bianco: The site of the guy who created the background image up to version 1.3.0.