Nowadays, I feel that no matter what kind of software almost have some corresponding alternative products, but only the Flash Player released by Adobe Company has no alternatives (HTML5 is trying to do this). Especially when we use web browser to surf on the Internet, we would find that it could be how terrible a thing without Adobe Flash Player.

Sweet Home 3D is a free, open-source and cross-platform (written in Java) interior aided design software from France. It can help you design and decorate your furniture on a 2D house plan, and allows to preview the whole panorama of the decoration layout with 3D perspective.

Ultrastar Deluxe is a free and open-source karaoke entertainment application for PC users, its inspiration comes from the SingStar music video game provided by SONY PlayStation console. It allows up to six players to sing along to a song or music video, and let players score points according to the pitch of voice and the rhythm of singing.

Now, the size of the HD movie or game is bigger and bigger, be a file more than 10 GB easily, let alone download, even if copying/moving on PC is a very time-consuming thing! Together with the popularity of large capacity mobile HDD and Flash disk, this is a very excruciating thing for those who needs to copy large files regularly, just have to look at the progress bar move slowly.

Pidgin (formerly named Gaim, and we can pronounce it "/?p?d??n/") is an open-source, cross-platform instant chat client application developed in GTK, supports all IM clients which using common instant communication protocols (see list below) at the same time.