Recently I needed a good PLSQL tool also on Linux, after the whole Oracle stuff has massive flaws I decided to use the best tool on the market (PL/SQL Developer from Allround Automations) with Wine.
After I really like how Codeweavers are supporting the open source project wine, I decided to purchase the commercial version Crossover (very close to wine).
I tried a bit around and what I found out is that on my Linux system (Debian Stretch with Gnome, 3 sreens) PL/SQL Developer 12 ist not working (windows flipping endless).
I decided to go to version 11, and also take the 32bit version (had a headache with 64 bit version on wine), I also took Windows 7 (why not its stable...) and the R11 instant client (because I know this version is working).

The results are fantastic, until now I could not find any bugs, all looks good, below you find the steps it took me.

    PL/SQL Developer 11 32bit (PL/SQL Developer downloads)
    Oracle Instant Client 11.2 32bit ( (Instant Client Download)

Create Bottle
Create a new Windows 7 32bit bottle (I did it via the cxsetup GUI, but of course you can also do it by script)

Open the c: drive of your bottle (wherever it is located on your system) and install the instant client

cd ~/.cxoffice/PLSQLDEV/dosdevices/c:/
mkdir -p oracle/network/admin
unzip ~/Downloads/instantclient-basic-win32-
mv instantclient_11_1 oracle/bin

Set some environment variables
Run regedit in the bottle (I did it via the bottle manager).

Create a Key Oracle in HKEY_LOCAL_MACHINE\Software.

Add bin directory to path and set TNS_ADMIN (so the client finds our tnsnames.ora files for sure).
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment
Edit PATH and add c:\oracle;c:\oracle\bin;

Add String TNS_ADMIN and set it to c:\oracle (yes I place my tnsnames file always in c:\oracle because I usually have multiple installations and want to just maintain one file).
Close regedit.

Create tnsnames.ora file.

cat > ~/.cxoffice/PLSQLDEV/dosdevices/c:/oracle/tnsnames.ora <<- EOF
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))

Install PL/SQL Developer 11
After everything is prepared just install the software into the bottle (did it again via GUI).