Konfederacja Wolność i Niepodległość (Confederation Freedom and Independence). It's a mix of various right-wing organizations who firstly decided to go together as one party on the last europarliament elections (they failed though). They are mostly composed of three groups.
First is Janusz Korwin-Mikke and his pals who are very pro free-market. He is quite a meme and some of you might recall him as he had some controversial speeches in euro parliament when he was deputy there few years ago.
Another group is National Movement. I don't recall them having very pro free market opinions, but also nothing in opposition to that, but what do they have in common for sure with Korwin is their dislike for current state of EU. They're mostly famous for organizing big yearly rally in Poland for Independence day which gathers more attendants that the official gobernment rally on that day, which is also a big source of yearly leftist and liberal butthurt. They are also our designated nadsis of polish politics.
Third group is basically just a single guy, Grzegorz Braun. I have no idea if his "group" consists of other people, never seen anyone who would declare such thing. He's an independent film producer, he was also a president candidate few years ago. How he gained popularity is a mistery to me. He have stronk pro-catholic views but also share many free-market opinions with Korwin and of course euro-skepticism too.
Despite being branded as right wing party, they're not in good terms with PiS.
Polls give them 7% but tbh there's real danger that they wont actually get into parliament.
Koalicja Obywatelska (KO, Civic Coalition).
As the name suggest it's a coalition consisted of few parties but it's the two biggest that are the most important.
First one is Platforma Obywatelska (PO, Civic platform). Current President of European Council, Donald Tusk (pbuh) comes from this party. However since he left for his EU office the party was basically in decline. This party is our designated pro-european and libtards people but more centre-right kind of closeted faggots as opposed to open faggots from SLD. In the past they had majority in parliament and ruled for 8 years but they also got bad opinon as thiefs, people who care only for moneys that comes from the position, broken promises, corruption in gobernment and sucking eu dick too hard. Apparently more left oriented people also were dissapointed with them at some point.
Second group is Nowoczesna (Modern). Basically same as above but with much much more focus on economy and with different people.
They have also some left-wing parties in this coalition but honestly I know pretty much nothing about them so I cannot comment.
Also I cannot comment much more about the first two groups tbh. I don't think they did much in recent years other then being in opposition and only sharing their butthurt publicly about PiS decisions.
Polls give them around 25% and they will surely be the main opposition force in the new parliament.
There are few other smaller parties but tbh I don't think they are worth mentioning right now, unless they somehow get into parliament (the polls don't really give anyone a chance except for those 5 I mentioned).