Yes you can. You can use it for Single Player AND Multiplayer. It works fine with LAN connections too.
because there are thousands of things in feed the beast that dont have textures
Feed the Beast is a mod pack put together, it has similarities to Technic Pack
Not even a cent! It is completely free. However, the more favorable mod pack for servers is now "Feed The Beast"
Well, i do not believe so. I can add the portal mod without a crash but once i carry over the files in the "minecraft" folder inside the feed the beast folder, i believe that crashes my game. I doubt it works but I may be doing something wrong :/
Check www.feed-the-beast.com
There's a Technic Launcher and something called Feed The Beast. In the Technic Launcher, you have things like tekkit, yogbox and in Feed The Beast you can choose from the mod packs that they show you.
Voxel Menu is also included in Feed the Beast, if you're interested.
mine does this too.... no idea what causes it but you're not alone
No, it's a texture pack.
Unfortunately, no. The Zeppelin mod was removed from technic.
Yes, some mods in Kovacic's mod pack for Minecraft may include a portal gun. The portal gun is typically part of the "Portal" mod or similar mods that can be integrated into mod packs. To find out if a specific version of Kovacic's mod pack includes it, you can check the mod list or documentation associated with the pack.
there is none unless you get a texture pack or mod