If you are looking for some free riot points and if you are from Europe than you may want to look online specifically for a riot points generator which should allow you to get the right code types that would be relevant and applicable to your location. If you are not careful and you just go ahead to avail yourself with just about any available codes, you may find it depressing that you may not be able to make the most of what you get. And this is for a reason because all accounts on league of legends tend to be regionalized and if you do not get the right codes for your region, you will simply not be able to use it.
You should therefore make sure that you only load those programs that would allow you to get riot points for your geographical region. If you are from Europe, then get something that would be worth it. European accounts tend to be different from accounts from other locations, which is why I recommend that you spend some time carrying out your research and picking the best code generator that should allow you to not only generate valid and working points, but also it should allow you to get as many and as often as you like.